How to Grow Cannabis 241 – Basics of Light

Do you want to be part of a private, professional community?
Join Now

Today on How-to-Grow Cannabis, we’re talking about lights. Growers Network has covered the subject numerous times before, but it’s appropriate that we actually explain why lighting is important, and why there’s so much disagreement over lighting.


In the 100s level of our How-to-Grow Cannabis series, we briefly mentioned that certain lighting “colors” are ideal for certain parts of the life cycle of Cannabis. Specifically, we said that bluish-white light is ideal for propagation and vegetative state, and that white light with a strong orange-yellow tint is more ideal for flowering state.

So on today’s article, we’re going to first explain what light is, and in our next article we’ll touch upon why things such as wavelength matter to our cannabis plants.


What is light? How do we measure it?


Let’s start today’s article off by making sure we’re clear on what light actually is, and why there are different colors of light.

Light, in its simplest form, is electromagnetic radiation. That might sound scary, but it’s actually quite normal. The only “radiation” that should worry you as a person is ionizing radiation, which is very high energy light that can cause direct damage to your cells. Ionizing radiation is not common in your day-to-day life, so it shouldn’t be a direct concern to you.

The light we see as humans is only a small fraction of the entire light spectrum. Our eyes are only capable of seeing a relatively narrow band of light known as the visible spectrum. “White” light is actually a composite of multiple different colors of light combined, and can be separated out into its constituent lights with a prism.

Author’s Note: Other species of animals can see different parts of the light spectrum; predatory reptiles can typically see in the infrared portion of the spectrum, and pollinating insects often see in the ultraviolet portion of the spectrum.

Light can be measured in multiple different ways, depending on its application, but we’re going to start simple and look at Amplitude and Wavelength, two very important components of defining light:

  • Wavelength refers to the physical length of the light. Yes, light has a certain “size.” Longer wavelengths are “redder” and contain less energy overall, while shorter wavelengths are “blue-er” and contain higher energy overall.
  • Amplitude refers to the intensity of the light. Think of it as the “volume” on a radio or music player. Amplitude does not change the color of light, only how strong that given light is.

Author’s Note: There are other important components of light, including polarization, propagation direction, and speed in a given medium, but these components are generally not important to your average grower.


Wavelength


Wavelength, as mentioned above, is a measurement of the physical size of the light “wave”. Longer wavelengths carry less energy, but are also able to pass through more material before being deflected or interrupted. Shorter wavelengths carry more energy, but also bounce into more objects in their way. This is why microwaves cannot exit the microwave machine, but radio signals can pass through nearly everything.

Image Courtesy of Wikipedia

The wavelengths of light that we can see (390nm - 700nm) make up in the visible light spectrum. Conveniently, this also the majority of the spectrum that plants use, in what’s known as “Photosynthetically Active Radiation,” abbreviated as PAR. Plants rarely use energy from wavelengths of light that are outside of the visible spectrum, although it does happen.

Image Courtesy of Wikipedia

The chart above shows the portions of the visible light spectrum that plants can use. As you can see, the most efficient wavelengths are between 400 to 500 nanometers (blue light), and 650 to 700 nanometers (red light). While there is usable light in the middle (green light), it is not as efficiently used. There is still much debate in the growing community over the value of green light in a growing scenario, but red and blue light is always ideal.

Looking for Wavelength When Buying Lights

Almost every horticultural lighting product will provide a spectral chart illustrating what wavelengths of light their lights should be able to hit. The gold standard for horticultural lighting is none other than the sun -- go figure! So let’s get a look at what the sun’s spectrum looks like in the visible light range:

Image Courtesy of ResearchGate. Red Lines added to indicate visible portion of spectrum.

As you can see, the sun’s output in the visible spectrum is roughly uniform. It peaks around the 450 nm range and gradually descends from there. This is the spectrum that many horticultural lighting producers are attempting to emulate, to varying degrees of success. Your ideal horticultural light will have a spectrum that looks something like this.

However, there isn’t one horticultural light that fits all needs. We’ll cover why in the next How-to-Grow Cannabis article, but essentially it stems from the fact that Cannabis is an annual plant.


Amplitude


The amplitude of light (or intensity) is important to almost all professional cannabis growers, but the advertising surrounding lighting products when it comes to amplitude is confusing. Intensity matters because even if you have the right spectrum, do you have the right amount of that spectrum? If there’s not enough light, plant growth can stall and the plant may die. If there’s too much light, the plant may experience permanent damage and stunting.

So where is the “just right” zone? Well, let’s start with figuring out what units we want to use first.

Lighting amplitude can be measured with multiple different units. For human applications (such as home or office lighting), the unit we typically use is lumens. This unit is inappropriate for growing plants, because the human eye perceives green light very intensely and violet and red light rather dimly. The opposite is true for plants.

Here is where PAR can come in handy. Since PAR already talks about the wavelengths relevant to plants, we can now add a measurement of the intensity of PAR. These intensity measurements are typically Photosynthetic Photon Flux (PPF) or Photosynthetic Photon Flux Density (PPFD). PPF measures the amount of photosynthetically active light being given out by a luminaire at any given moment, and PPFD measures how tightly focused the PPF is in a target area. In other words, PPF measures the total amount of light originating from your luminaire, PPFD measures how much of that light is being concentrated onto the plant surface.


Ok, that’s a lot of mumbo-jumbo. What does this mean for buying lights?

Well, the simple version is that most horticultural lights designed with cannabis lights in mind should be able to fit your needs. Check the spectrum and output of course, but generally most lights will be able to grow cannabis. In our next article, we’ll go over what kind of lighting decisions you should make in regards to the life cycle of your plant, and why it matters.

As always, let us know your thoughts in the survey below, or on the forum!


Enjoyed the article? Want to continue the conversation?
Join Now


Do you want to receive the next Grower's Spotlight as soon as it's available? Sign up below!


Do you have any questions or comments?

Feel free to post below!


About the Author

Hunter Wilson is a community builder with Growers Network. He graduated from the University of Arizona in 2011 with a Masters in Teaching and in 2007 with a Bachelors in Biology.


How Cannabis Has Influenced Culture: Politics in the US

Do you want to be part of a private, professional community?
Join Now

We are not crooks. HAROO. Today Growers Network discusses how Cannabis has influenced politics in the US.


When Growers Network first started this series on how Cannabis has influenced culture, it all seemed simple. We’d hit some of the major touchpoints of culture, call it a day.

Then we did our research. Hoo boy!

Author’s Note: Earlier periods of time have fewer records and will tend to have more legends and myths associated with them. In this article I will attempt to cite my sources, but hearsay can be tricky to determine.


17th Century and Earlier

We’ll start in colonial times, prior to the Revolutionary War. Cannabis was first introduced to the Americas in 1606 (source) and it was considered an important agricultural crop. In 1619 the Virginia Assembly even went so far as to mandate that every farmer would be required to grow hemp (source).

The early introduction of hemp to the North American colonies shouldn’t be surprising because both Queen Elizabeth and King Henry VIII mandated that farmers should grow hemp in England (source) only 50 years prior. Since England, was a seafaring nation, it should come as no surprise that hemp fiber was highly valued for its high tensile strength, making it an ideal material for sails and ropes. In fact, the word “canvas” is derived from the word “Cannabis(source).


18th Century

Throughout the 1700s, because of its value as a fiber, several colonies mandated that all farmers grow hemp (source). George Washington, Thomas Jefferson, and John Adams would later advocate for hemp production on farms. Recently this has come full circle, because Mount Vernon is growing hemp again.

I want to address the giant pink green elephant in the room. There are many stories about how Thomas Jefferson or George Washington used to smoke Cannabis flowers, but is there any truth to this? The Monticello did an in-depth analysis of contemporaneous documents and found no evidence for such behavior. This correlates with our understanding of hemp at the time -- most Cannabis in the New World had very low THC levels, making smoking it unpleasant.

While people weren’t smoking Cannabis, it was being used for more than just fiber. Estimates from the time period suggest that 75-90% of all paper was hemp-derived. The first drafts of the Declaration of Independence would be written on hemp-derived paper, with the final version being printed on more-expensive parchment (source). There is also some evidence that early drafts of the US Constitution were written on hemp-derived paper, with the final draft being written on parchment (source). This makes sense, given that in the time period these two documents were written, hemp paper was more common and cheaper, while parchment was more expensive and more durable.

During this time period, there are also some early references to the intoxicating effects of Cannabis, and some suggestions that high-class gangs in London used Cannabis to get high (source). However, it wouldn’t be until the 19th century that the intoxicating effects of Cannabis would start to get noticed by most of Western society and the USA.


19th Century

The period between the Revolutionary War and the War of 1812 was mostly marked by peace and growth. The Native Americans weren’t so fortunate, and conflicts with Native American tribes began to emerge prior to the War of 1812. When the War of 1812 came around, Cannabis’ significance emerged yet again.

Warships were needed during the War of 1812 in order to fight the British, and with the need for warships came the need for hemp fiber. The USS Constitution was constructed in 1797, but its most notable engagements were during the War of 1812. When it was built, it required nearly 122,000 pounds of hemp fiber for its construction (source). And that was just a single warship -- there were a handful of others in the US’ employ during that same time period.

As the 19th century rolled on, the use of hemp for fiber products began to wane. Alternative fiber crops such as jute and cotton became more common and easier to process and produce (source). Towards the end of the 19th century, many sailing ships stopped relying upon fiber-intensive wind sails and began to rely upon iron and steel engines. However, hemp and Cannabis began to find other uses. Hemp oil and hemp derivatives began to appear in the mid-19th century and found regular shelf space in apothecaries and pharmacies towards the end of the 19th century (source).

Another myth about one of the US presidents emerges during this time -- one in which Abraham Lincoln supposedly enjoyed smoking “sweet hemp on his porch”. However, contemporaneous evidence contains no proof of this legend (source). While it is possible Abraham Lincoln fueled some of his lamps with hemp seed oil, there is no definitive evidence.


1900-1937

The trend of using hemp derivatives as medicine continued well into the 20th century, and many pharmacies and apothecaries carried Cannabis tinctures and syrups, and many doctors prescribed Cannabis preparations to their patients (source).

Around this time, recreational use of Cannabis started to become noticeable. The word “marijuana” began to enter common parlance in the US, as Mexican immigrants who were known to smoke Cannabis flowers became more common in the Southern United States (source). Racial fears and tensions were stoked during the Great Depression, harming the public perception of Cannabis, as Mexicans and African Americans were most commonly associated with the recreational use of Cannabis. These minorities were blamed for a variety of problems, including “Reefer Madness.”

During this time period, Cannabis gained much notoriety and became the subject of numerous songs about its use. You can read about how Cannabis affected music here.

This would all come to a head with the Marihuana (sic) Tax Act of 1937, which effectively made Cannabis illegal in the United States. The act was passed despite the complaints of the American Medical Association and other physician’s organizations (source). The Marihuana Tax Act made non-medical and non-industrial uses of Cannabis illegal, completely banning recreational use of Cannabis. It also imposed significant taxes on physicians prescribing Cannabis products, and levied an annual tax on hemp farmers.


1937-1952

Despite the prohibition against recreational Cannabis, hemp was not illegal after the Marihuana Tax Act of 1937. It would persist as a valuable agricultural commodity through World War 2, and the US government would even encourage hemp farming for the war effort (source). During WWII, the US Government temporarily lifted the Marihuana Tax Act of 1937 to encourage hemp production, but would reinstate the act after the war.

Recreational Cannabis use would persist, but in secret. Musicians and artists were known to continue using recreational Cannabis, but records are spotty given its illegal status at the time.


1952-1970

1952 and 1956 were the years that would render all Cannabis, including industrial hemp and medical products, illegal in the United States. 1952 saw the introduction of Boggs Act of 1952 and 1956 saw the Narcotics Control Act of 1956. The Boggs Act set mandatory minimum sentences for drug convictions, and the Narcotics Control Act determined that all Cannabis (including hemp) was an illegal drug.

Because of these laws, all Cannabis growth went underground (figuratively, not literally). Luckily, this time period coincided with the start of hydroponics and commercially viable artificial grow lighting. While outdoor guerrilla grows would continue due to their economic efficiency, the conditions were ripe for indoor Cannabis growing to be born.


1970-1974 - Richard Nixon and the CSA

Now… we arrive at Richard Nixon. Up to this point, there were politicians who used Cannabis prohibition to further their own ends, but none quite like Richard Nixon. Richard Nixon oversaw the implementation of the Controlled Substances Act which scheduled Cannabis (and all cannabinoids) as a schedule 1 narcotic. Nixon also started what is colloquially called the “War on Drugs” and reportedly used it to target minorities and groups who were likely to favor the Democrats.

Needless to say, this strong anti-drug fervor led to the creation of all sorts of anti-drug slogans, advertisements, Public Service Announcements, and more. Cannabis was dragged into the label of “narcotic” and often explicitly targeted. But this was just the beginning; Ronald Reagan would take it even further.


1981-1989 - Ronald Reagan and the War on Drugs

We briefly skip over the presidencies of Gerald Ford and Jimmy Carter largely because nothing new happened with regards to Cannabis. The policies of the Controlled Substances Act and the War on Drugs continued, guerrilla grows continued, and generally not much changed. Jimmy Carter opposed the criminalization of Cannabis, but was unable to gain any traction in his efforts (source).

Ronald Reagan, however, took anti-Cannabis to a whole new level:

The Reagan administration regularly put out content and PSAs against drugs, and particularly Cannabis. Nancy Reagan, the First Lady, started the “Just Say No” campaign which was her primary initiative as the First Lady. During this time, the AIDS epidemic in the US was really kicking off, and Cannabis was partially blamed as a gateway drug to harsher drugs that could carry HIV. Even children’s programming contained anti-Cannabis messages:


1993-2000 - Bill Clinton

We’re going to skip over George H.W. Bush’s presidency, although it is worth mentioning that under his presidency, companies that sold equipment to Cannabis producers were targeted, expanding the DEA’s power.

Now we get to the Clinton years, where we see the first signs of the ice melting. Famously, during his run for the presidency, Bill Clinton said that he smoked marijuana, but he “didn’t inhale.”

During Clinton’s presidency, California would legalize medical Cannabis with the Compassionate Care Act of 1996, the first act of its kind to attempt to decriminalize Cannabis in the US. While overall governmental policies regarding Cannabis showed few signs of movement, there was finally movement on the issue. Oregon, Alaska, Washington, and Maine would all legalize medical Cannabis during Clinton’s presidency.


2008-2016 - Barack Obama

We’re skipping over George W. Bush’s presidency, because government policies regarding Cannabis generally didn’t change. More states legalized medical Cannabis during his presidency, continuing what started under Clinton.

However, we start to see real movement on the issue under Barack Obama’s presidency. In 2012, Colorado and Washington became the first two states to legalize recreational Cannabis, and Barack Obama put the Cole Memo into effect in 2013, preventing the Justice Department from enforcing prohibition in states where Cannabis had been legalized. The Rohrabacher-Farr Amendment would come in 2014, reinforcing the provisions of the Cole Memo. Neither of these policy changes have affected the legal status of Cannabis, but remain popular.


2016-Today - Donald Trump

In 2016, Donald Trump was elected to the presidency, and appointed Jefferson Sessions III as his attorney general. While Donald Trump indicated indifference on the subject of Cannabis, AG Jeff Sessions was staunchly anti-Cannabis, saying “Good people don’t use marijuana.” He overturned the Cole Memo, but was kept at bay by the Rohrabacher-Farr Amendment. He would later be fired by Donald Trump.

In 2018, the STATES Act was introduced by Senators Cory Gardner (R-CO) and Elizabeth Warren (D-MA) and could potentially provide an avenue towards total legalization in the US. The STATES Act shows bipartisan support in the House of Representatives and Senate. Also worthy of note in 2018 was the passage of the US Farm Bill which included a provision descheduling hemp, meaning that industrial hemp is now legal throughout the US once again. The measure was spearheaded by Kentucky Senator Mitch McConnell.


And that’s where we’re at today. What will the future hold? If current trends continue, we’ll likely see the complete legalization of Cannabis at the federal level in the US during our lifetimes. Some optimists believe we will see it as early as 2020, and some of the more pessimistic expect 2024 or 2028. Regardless, the pendulum of society has shifted, and most see legalization as inevitable in the US.

So what do you think? What country should we cover next? Let us know in the survey below or on the forum.


Enjoyed the article? Want to continue the conversation?
Join Now


Do you want to receive the next Grower's Spotlight as soon as it's available? Sign up below!


Do you have any questions or comments?

Feel free to post below!


About the Author

Hunter Wilson is a community builder with Growers Network. He graduated from the University of Arizona in 2011 with a Masters in Teaching and in 2007 with a Bachelors in Biology.


What a Year for Cannabis

Do you want to be part of a private, professional community?
Join Now

Boveda takes us through 2018 and what it meant for Cannabis. This was not a small year -- massive leaps forward have happened!


Disclaimer

This article was originally posted on Boveda’s blog. If you would like to read the original article, please click here.


What a monumental year for the cannabis industry. Public perception has rapidly shifted on a plant that was demonized and devalued. Now people of all ages, backgrounds and political affiliations are discovering the benefits of cannabis — from helping to reduce childhood epilepsy problems to increasing tax revenue in cash-strapped states.

Here’s an overview of some of the most significant cannabis news stories of the year and their impact on the industry. 2019 promises to be an even bigger year for this emerging market, and Boveda is excited to be a part of it.


FDA Approves First Cannabis-Derived Medication

After years of clinical trials and much anticipation, the United States Food and Drug Administration (FDA) officially approved Epidiolex as an oral solution that can be used to treat two severe forms of childhood epilepsy. The UK-based company that created Epidiolex, GW Pharmaceuticals, produces the medicine from cannabidiol (CBD) and its derivatives. Patient trials show that the drug has incredible effectiveness in reducing seizures in persons ages two and up. This approval has led to an increased interest in medical cannabis, and R&D budgets are steadily increasing in regards to cannabis.


Global Cannabis Legalization Ramps Up, Canada Commences Adult-Use Cannabis Sales Nationwide

Cannabis legalization exploded around the world in 2018. Numerous countries in Europe, Latin America, Asia, and South America approved medical cannabis. The UK will become one of the largest medical markets. Although South Korea has been historically anti-cannabis, the country is now looking to approve medicinal cannabis. The Supreme Court of Mexico ruled that cannabis prohibition is unconstitutional there. Mexico’s incoming president was already signaling support for reform at the time, and this news will pave the way for nationwide legalization.

Of course, the biggest news this year is the adoption of adult-use cannabis sales in Canada. Prime Minister Justin Trudeau campaigned on the subject. Canada officially approved legalization in the spring and on October 17, thousands of eager Canadians purchased Cannabis at brick-and-mortar dispensaries or online through provincial shops. Many retailers ran out of product.


Michigan and Vermont Approve Adult-Use, Oklahoma, Missouri and Utah Approve Medical

Cannabis reform advanced in the United States, too. Five more states approved medical or adult-use. Vermont was the first state whose state legislature legalized cannabis, whereas most states relied on ballot initiatives to legalize cannabis. During the midterm elections, voters in Michigan said “yes” to recreational sales. Meanwhile, residents of Oklahoma, Missouri and Utah voted to approve medical cannabis. Unfortunately, North Dakota failed to pass legal adult use at the midterms. The opposition outspent proponents by an 8-to-1 margin.


Big Alcohol and Big Tobacco Make Record-Setting Investments in Cannabis Companies

Nicotine sales are down, particularly in states where cannabis is legal, so this shift only makes sense. The same goes for alcohol sales. A majority of cannabis consumers believe using cannabis is safer than drinking alcohol, according to a recent consumer survey conducted by New Frontier Data.

In 2018, a lot of major investments came from unlikely sources. Constellation Brands invested $4 billion in Canadian cannabis cultivator Canopy Growth. Constellation is the beverage behemoth behind Corona beer, Svedka vodka, and Robert Mondavi wines. Not long ago, AB InBev, makers of Budweiser, Labatt, and Rolling Rock, announced a $100 million partnership with Canopy rival Tilray. The duo intend to develop non-alcoholic, cannabis-infused drinks.

Additionally, Altria, one of the biggest tobacco companies in the world, forayed into a different cigarette product by investing $1.8 billion in The Cronos Group, another Canadian cannabis producer.


The Farm Bill is Signed Into Law, Brings With it Hemp Reform

2018 closed with yet another victory for the cannabis industry. The massive U.S. Farm Bill included the Hemp Farming Act of 2018. Senator Mitch McConnell (R-KY) championed the legislation that effectively legalizes industrial hemp production in the United States. The law deschedules hemp, defined as containing less than 0.3% THC.

Hemp is used to make a plethora of products, from textiles to plastics. Hemp also typically contains high amounts of cannabidiol (CBD), a non-psychoactive cannabinoid that is becoming popular as a treatment for a variety of illnesses and ailments. However, the FDA has asserted authority over CBD, stating that it is still illegal as a food additive and cannot be promoted as a medicine. Despite this, 2019 is expected to be a record-setting year for sales of CBD products nationwide.


Enjoyed the article? Want to continue the conversation?
Join Now

Do you want to receive the next Grower's Spotlight as soon as it's available? Sign up below!


Do you have any questions or comments?

Feel free to post below!


About the Author

Rachelle Gordon is a Minneapolis-based freelance writer and educator in the cannabis space. She has dedicated herself to informing others about the powers of plant medicine after witnessing her father’s struggle with epilepsy (and subsequent stroke) in her childhood.



How to Grow Cannabis 232 – Hydroponics?

Do you want to be part of a private, professional community?
Join Now

In this 200s How-to-Grow Cannabis article, Growers Network discusses hydroponic methods that might be worth considering.


Hello growers! In our 100s level articles, we primarily focused on growing in a soil, a time-tested and traditional method of growing. There’s absolutely nothing wrong about growing in soil, and if it’s all you want to do and all you want to be comfortable with, then that’s ok. However, hydroponic methods offer a lot of unique benefits that you won’t get from soil, so we’ll go over a few different types, and let you decide what interests you.


Why hydro?


As we mentioned in our last article focused on different mediums, hydroponic growing styles afford a level of control that growing in soil does not. You can custom tailor exactly how much water your plant gets, how many nutrients your plant receives, the exact pH of your system, and on top of all that, you can record tons of data for your grow journal. This data can tell you how specific strains react to specific situations, and can help inform future grows.

In soil, you rarely get this kind of control or this kind of data. There’s more guesswork involved and a stronger reliance on your gut feelings. This isn’t necessarily bad, but it may prove difficult or tedious as you ramp up the size of your grow.

Additionally, hydro growing styles and growing mediums offer a unique chance to control and monitor pests and diseases. In soil grows, you generally can’t get a good glimpse at what’s happening in the root zone of your plants. It’s a mysterious black box. But in hydro grows with certain media such as rockwool, you absolutely can take a peek at what’s going on at the root level, removing some of the guesswork involved.

One other benefit of hydro that becomes really important on a commercial scale is that hydro growing mediums and growing styles can reduce the amount of space your plants take up. In traditional soil, plants roots need to spread out a much greater distances in order to get sufficient resources, and may end up root-bound if there’s not enough space. But with certain hydro growing styles, the required amount of space can be decreased. If you’re growing indoors, this can be a massive boon.


Hydro Growing “Styles”


In this section we’ll go over a few of the different types, how they act, and their pros and cons.

First though, we should cover the issue of what is sometimes called “Drain-to-waste” hydro growing. Essentially, almost all hydro systems can be designed to be closed-loop or open-loop. A closed-loop system will recirculate and reuse nutrient water, although it requires more effort to maintain. An open-loop system, or “drain-to-waste” will use nutrient water once and drain it off - either to the sewer system or a barrel which does not cycle back into the system.

As you can probably ascertain, closed-loop systems use less water and are more environmentally-friendly, but require more maintenance. Open-loop systems are easier to manage, but waste more water. Most municipalities and counties that regulate water input and output will prefer closed-loop systems or strongly encourage them.


Static Hydro

Perhaps the simplest method of growing hydroponically, this method takes an opaque bin or container, fills it with nutrient water, and dips the plants roots in the water. All light to the water is blocked to prevent the formation of molds and algae.

Pros:

  • Simple
  • Cheap, no electricity required
  • Low Maintenance, no moving parts
  • Good for small plants

Cons:

  • Water oxygenation is poor, roots will only get so deep into the water
  • Plants cannot grow beyond a small size
  • Relatively little control

Deep Water Culture

Deep water culture is like a more-advanced form of the passive hydro system. Essentially, the plants and their media are set into a giant floating “raft” that is suspended over a relatively large pool of water that the roots dip into. The water is oxygenated with air stones and air diffusers, and the water is typically circulated via a propeller or pump. The water can be regularly monitored and nutrients or water added as needed. This method operates continuously.

Pros:

  • Relatively simple operation
  • Minimal electricity usage
  • Only a few moving parts
  • Easily scalable

Cons:

  • Long power outages or equipment breakages can cause plant roots to drown
  • Initial setup requires a fair amount of investment and water
  • Water oxygenation is ok, but will be the limiting factor for plant growth

Ebb-and-Flow

Ebb-and-Flow, also called Flood-and-Drain, is a hydroponic method where the growing medium and plant roots are periodically flooded with nutrient solution that is pumped up from below via a mechanical pump. This method requires flood trays, pumps, a reservoir or reservoirs, and typically operates on a timer.

Pros:

  • Good water oxygenation due to pumping
  • Nutrient solution can be regularly monitored and changed in reservoir
  • Plant size is theoretically unlimited
  • This method is very gentle on roots

Cons:

  • Water pumps are subject to breaking, as are any mechanical parts.
  • Tubing and trays may leak due to wear and tear
  • This method only works with certain mediums (that don’t get flushed out with water) and may require more specific equipment
  • This method requires electricity. While short power outages aren’t a big deal, long power outages could result in problems.

Nutrient Film Technique

Nutrient Film technique, sometimes called continuous flow, suspends plants and their media in a tube (typically PVC) that is constantly cycling nutrient water. The water is cycled through a reservoir where it can be checked for nutrients, and then cycled back to the plants. This method operates continuously.

Pros:

  • Excellent oxygenation, the plants’ roots will rarely have any issues with oxygen
  • This growing method tends to accelerate the growth rate of plants, as they can take however much water and nutrients they need.

Cons:

  • This method is expensive to set up.
  • This method is very susceptible to power outages. Any power outage could cause serious damage to the plants.
  • The water pump can break and cause problems.
  • The lines and tubes connecting the system can become clogged.
  • Difficult to scale up or down.
  • Plants towards the end of the tubes get access to fewer nutrients, as the plants at the front of the tubes take up what they need first.

Drip Emitter

Drip emitters are a commonly-used system in both hydroponic and soil grows where a small tube of water with an emitter at the end is plugged into the soil or medium where the plant grows. Due to water pressure in the water line, a “drip” is constantly being emitted, feeding the plant. Nutrients can be added through the line or added separately. Runoff can be cycled back into a reservoir, or run to waste. This method operates continuously, and relies on water pressure. Alternatively, it can be set to run on timers.

Pros:

  • Simple, relatively easy to operate
  • Relatively cheap to implement
  • Water oxygenation is great.
  • No electricity required, just plumbing
  • Easily scalable.

    Cons:

    • Has no sense for the amount of water plants need, and can overwater or underwater the plants pretty badly if not set properly.
    • Wear and tear to the water lines can cause problems further down.

    Aeroponics/Fogponics

    Aeroponics is a unique hydroponic method of growing where the plant is suspended in a closed container which is regularly misted or fogged with nutrient water. The roots are held in this fog and take nutrients as needed. The system operates based on sensors and controllers to prevent over- and underwatering.

    Pros:

    • Water oxygenation is impossible to beat.
    • Plants grown this way do not suffer transplant shock.
    • Water is used extremely efficiently.
    • Does not require a medium.
    • Diseases and pests generally cannot survive these conditions.
    • Does not require gravity (not a particular benefit to most growers, but hey, it’s important to NASA)

    Cons:

    • Microbial inoculants provide very limited benefits with this method.
    • Electrical outages can cause plant roots to dry out quickly.
    • Misters and sprayers may tend to clog and require regular maintenance.
    • System requires careful monitoring to prevent roots from drying out or becoming soaked. As such, the system is typically more expensive to implement.

    Conclusion


    We didn’t mention a few types of hydroponic growing methods (top-fed deep water culture, passive sub-irrigation, rotary systems, etc), but this list covers the vast majority of hydroponic growing methods you’ll encounter in most Cannabis grows. If you have a favorite method, please let us know in the survey below or on the forums!


Enjoyed the article? Want to continue the conversation?
Join Now


Do you want to receive the next Grower's Spotlight as soon as it's available? Sign up below!


Do you have any questions or comments?

Feel free to post below!


About the Author

Hunter Wilson is a community builder with Growers Network. He graduated from the University of Arizona in 2011 with a Masters in Teaching and in 2007 with a Bachelors in Biology.


When Marijuana Votes Don’t Turn into Marijuana Laws

Do you want to be part of a private, professional community?
Join Now

Susan Gunelius of Cannabiz Media points how several US state governments try to ignore the will of the people when it comes to cannabis.


Disclaimer

This article was originally published on Cannabiz Media's blog. If you would like to read the original article, click here.


In states that have approved medical and/or recreational marijuana, it’s not uncommon for state governments to ignore the voices of their constituents. People reliably vote for medical marijuana or adult-use marijuana, but when push comes to shove, government officials are slow to develop the marijuana programs that would put those laws into action, or implement laws hindering those programs.

Suddenly, “legal” medical or recreational marijuana becomes “legal,” but all of the restrictions end up limiting access and raising prices for the people who voted for legalization.

Florida residents had to deal with this problem last year after the vast majority of Florida voters cast their ballots in support of Amendment 2 in November 2016. Amendment 2 was intended to expand the state’s medical marijuana system significantly beyond the 1,800 residents who qualified for medical marijuana at the time.

The problem was that Florida lawmakers seemed set on blending Amendment 2 with existing marijuana laws rather than listening to voters and developing a new regulatory framework for medical marijuana. Advocates for Amendment 2 fought against this blended approach citing two primary issues:

First, the proposed blended law would limit the number of approved marijuana cultivators (who were also the only approved distributors and sellers) to the existing seven, stifling growth. Second, the law that residents voted in favor of would allow doctors to prescribe medical marijuana for debilitating medical conditions of the same kind specifically listed in the amendment if there was evidence that the use of marijuana outweighed the potential health risks. The blended rule proposed by lawmakers instead required that a medical board approves each condition first. These two approaches were not in alignment, and it was clear that state lawmakers weren’t listening to their constituents.

Florida wasn’t the first state that ran into delays and unexpected changes when they created and implemented marijuana laws. Massachusetts residents voted in favor of legal marijuana during the November 2016 election, but on December 29, 2016, the Massachusetts House and Senate passed a bill that delayed the opening of marijuana shops in the state by up to six months.

The Massachusetts bill was passed under somewhat dubious circumstances; it was voted on during informal sessions in both legislative chambers without a public hearing or a debate. Making matters worse, only a small number of lawmakers were actually present when the bill passed, because many of them were away for the holidays at the time. Ultimately, marijuana sales in Massachusetts didn’t begin until November 20, 2018. This sneaky behavior didn’t halt the will of the people, but slowed it down.


Volatility is the Norm in the Marijuana Industry


In Colorado, a different kind of volatility made it difficult for some marijuana retailers to stay in business. A law passed in 2016 required dispensaries and growers to have all of their marijuana products tested. This created a significant burden for some dispensaries and businesses because Colorado’s marijuana dispensaries must obtain state and local licenses to operate. Without both licenses, they cannot get their products tested. Multiple municipalities didn’t have local licensing systems in place in time to meet the new law’s July 1, 2016 deadline, forcing these businesses to shutter until they could get local licenses.

The Colorado example shows how even though residents voted a long time ago to legalize cannabis, the laws detailing industry practices cans cause the system to behave quite differently from how voters expected it would when they cast their ballots. In other words, there is a discrepancy between state and local rules that often goes against voters’ choices on state laws.

However, the problem is not isolated to states that already have marijuana programs. On November 6th of 2018, Wisconsin voters in 16 counties and two cities (accounting for nearly half of the state’s residents) were asked to weigh in on advisory referendums related to medical and adult-use marijuana, which appeared on their ballots. Wisconsin residents overwhelmingly approved those referendums by margins of two-to-one, three-to-one, and four-to-one.

These results shouldn’t be surprising to lawmakers because 2018 Marquette Law School poll of Wisconsin voters found that 61% of respondents believed marijuana should be federally legalized and regulated like alcohol. However, change is unlikely to come anytime soon in Wisconsin for two main reasons:

First, the referendums were non-binding, so the state government doesn’t need to do anything. Second, key Republican government leaders in Wisconsin, like Republican Wisconsin Senate President Roger Roth, have publicly stated that they oppose marijuana legalization of any kind, making progress incredibly difficult.


Can State Governments Bring Votes and Laws Together?


Variations in laws should be expected while marijuana is still illegal at the federal level, but state and local rules should always adhere to the voice of the people. In many cases, that is not happening. Democracies should listen to the will of their people, and many politicians are valuing their personal beliefs over what their constituents are asking for.


Enjoyed the article? Want to continue the conversation?
Join Now


Do you want to receive the next Grower's Spotlight as soon as it's available? Sign up below!


Do you have any questions or comments?

Feel free to post below!


About the Author

Susan Gunelius, Lead Analyst for Cannabiz Media and author of Marijuana Licensing Reference Guide: 2017 Edition, is also President & CEO of KeySplash Creative, Inc., a marketing communications company offering, copywriting, content marketing, email marketing, social media marketing, and strategic branding services. She spent the first half of her 25-year career directing marketing programs for AT&T and HSBC.


What’s Happening with California Lab Tests?

Do you want to be part of a private, professional community?
Join Now

Hello Growers Network! Some of you may have heard of some recent issues happening with California cannabis testing, so we’re here to help clarify what’s happening.


It seems to be a pattern now. A new state that has come online with fully legal adult-use cannabis is having issues surrounding its laboratory testing procedures. First it was Oregon, which had a serious shortage of laboratories, driving up the prices for cannabis. Now it seems it’s California’s time for laboratory woes.


So what’s going wrong?


Well, there’s a few different problems, I’ll enumerate them here:

  1. Some labs seem to be falsifying their tests, passing an abnormally high percentage of samples. There is a general sense of a “pay-to-play” atmosphere with certain labs.
  2. Statewide, there was a failure rate of nearly 20% for samples submitted for testing in the first two months. The problem has recently improved to a 14% failure rate, which is still high, but not as bad. This problem may not be the laboratories’ faults either.
  3. There are only 57 certified testing facilities for the entire state. In a smaller state, that might be sufficient, but the California market is huge, and there is a lot of cannabis to be tested. This can lead to delays and potentially product loss.

What’s causing the problems?


Well, like any new market, there are speed bumps along the way. California was the first state in the USA to legalize medical cannabis in 1996, and thus served as a testing grounds of sorts. For a long time, regulations were relatively minimal and difficult to enforce. Additionally, the federal government continued to carry out raids and enforcement on a federal level until President Obama officially signaled the Justice Department would no longer pursue cannabis cases in states that had legalized cannabis with the Cole Memo.

With the passage of Proposition 64 that legalized adult-use cannabis in California, the laws concerning cannabis production and regulations changed to much stricter standards. For some long-time growers, the change might seem like a whiplash, despite a relatively long period before implementation of the standards. Some growers who had previously operated in a relatively gray space now found themselves having to change their methods to accommodate these stricter standards.

This would explain the high failure rate, which is probably not the fault of the laboratories themselves. Since the failure rate seems to be improving pretty rapidly (20% failure rate to 14% failure rate in a few months), people are starting to improve.


As for the test falsifications and “pay-to-play” environment for laboratories, this issue may stem from the same source. Prior to Proposition 64, testing laboratories were not required by law and had no standard operating procedure enumerated for themselves. Many laboratories offered their services because it made for good marketing for the cannabis producers. Producers could “back up” their claims from laboratory tests. This created a system that incentivized laboratories providing higher numbers to their clients than strictly controlled tests would actually show.

Some companies continued this trend into Proposition 64 implementation, but finally got caught. So while at first glance, it might appear that Proposition 64 is the source of these problems, it’s actually fixing a longstanding problem.


As for the limited number of licensed laboratories, the situation is changing pretty rapidly. During the course of my research for this article, I came upon other articles that referenced much lower numbers of laboratories. Here’s a rough timeline of licensed laboratories:

In other words, California has almost doubled its number of licensed laboratories in 6 months. This is good news for cultivators and distributors, and it seems likely that this trend will continue.


The Takeaway


From an outsider’s perspective, it looks like California’s cannabis testing laboratories are actually facing speed bumps that one could have reasonably predicted, given the state’s history when it comes to cannabis. What seems to be happening are normal growing pains as California’s market matures, and it is likely that the problems we are seeing will gradually smooth out.

But you know what? I could be horribly wrong. If I am, I’ll follow up this article with another detailing how I was wrong. What are your thoughts? Let us know in the survey below or on the forum!


Enjoyed the article? Want to continue the conversation?
Join Now


Do you want to receive the next Grower's Spotlight as soon as it's available? Sign up below!


Do you have any questions or comments?

Feel free to post below!


About the Author

Hunter Wilson is a community builder with Growers Network. He graduated from the University of Arizona in 2011 with a Masters in Teaching and in 2007 with a Bachelors in Biology.


From Queso to Cannabis — Drying and Curing Solutions

Do you want to be part of a private, professional community?
Join Now

In this Growers Spotlight, we spoke with Neville McNaughton (CEO) and Jane (Director of Marketing) and David Sandelman (Engineer) of Sanitary Design Industries about how they’re taking a technology they invented for the cheese and meat worlds to the drying and curing phase of cannabis.

                    
Neville McNaughton (CEO)                                     David Sandelman (Engineer)                                   Jane Sandelman (Director of Marketing)    

The following is an interview with industry experts. Growers Network does not endorse nor evaluate the claims of our interviewees, nor do they influence our editorial process. We thank our interviewees for their time and effort so we can continue our exclusive Growers Spotlight service.

To skip to any section within this article, click the links below:

  • Short on time? Check out our shortened article!
  • Drying and Curing
  • About SDI
  • Resources
  • Comments

  • Abbreviated Article


    Editor's Note: Growers Network appreciates its readers! If you are limited on time, we are now offering abbreviated versions of our articles. Click below to view.

    If you like the abbreviated article, let us know in the survey at the bottom of the article! We're always interested in hearing your feedback.

    If you want to read more, you can read the full article below.


    Drying and Curing



    About SDI



    Enjoyed the article? Want to continue the conversation?
    Join Now


    Do you want to receive the next Grower's Spotlight as soon as it's available? Sign up below!


    Want to get in touch with Sanitary Design Industries?

    You can reach them via the following methods:

    1. Website: http://www.sanitarydesigns.com/
    2. Phone: 314-647-5361
    3. Email: info@sanitarydesigns.com

    Do you have any questions or comments?

    Feel free to post below!


    About the Author

    Hunter Wilson is a community builder with Growers Network. He graduated from the University of Arizona in 2011 with a Masters in Teaching and in 2007 with a Bachelors in Biology.


    How to Grow Cannabis 231 – Blame the Media

    Do you want to be part of a private, professional community?
    Join Now

    Today we’re going to talk in great in depth about propagation at the caregiver level. Today’s topic is media.


    Howdy folks!

    In our 100s series of How-to-Grow Cannabis, we focused on growing in soil and basically didn’t touch any other growing media. We focused on soil because it’s perhaps the easiest to use. Good soil is alive and will generally maintain itself. It only needs inputs occasionally. However, soil is also very constraining -- it tends to take the most space and your plants may not grow at their most efficient in it.

    So today we’re going to cover some of the most common media types you will generally find in a commercial or caregiver setting, the pros and cons of each, and why you might prefer one medium over the other. No media is able to do everything perfectly, so pick the one most appropriate for your style of growing.


    Rockwool


    Considered the most “advanced” medium to date, Rockwool (sometimes called stonewool) is made from extruded strands of superheated rock that have been woven into a dense, fibrous block or plug.

    Pros:

    • Without a doubt, rockwool is the cleanest media on the market. Very little microscopic life can survive on it without your assistance, and it’s dangerous for insects because the microscopic rock can slice up their exoskeletons.
    • Rockwool is reusable with a little bit of work, sometimes referred to as “recharging.”
    • Rockwool can be reshaped or cut into smaller sizes, just make sure to wear a respirator if you choose to do so.
    • Rockwool retains whatever shape it is given, making it ideal for transplanting.
    • Rockwool drains really well and provides excellent oxygenation for plant roots. If you’re running a hydroponic setup, rockwool can make your life easier.

    Cons:

    • Rockwool requires preparation to be used, sometimes called “charging.” Generally the rockwool when it’s first received is at a pH that is not conducive to plant life, and it will need to be placed into a water solution with a pH of about 4.5-5 pH to get it to the proper acidity.
    • Rockwool is formed from microscopic fibers of rock. Like any other rock fiber, it is dangerous to inhale small fragments. If you wash it before use, you should generally avoid the worst of this problem.
    • Rockwool is probably the most finicky of mediums, and will require more active maintenance than other mediums.
    • Rockwool is not recyclable. Luckily, you shouldn’t feel too guilty about throwing it out if you need to, because it’s literally just rocks.
    • Rockwool is one of the most expensive mediums on the market. For this reason, many growers opt to use rockwool only during the propagation stage to reduce their costs.

    Coco Coir


    Besides rockwool, Coco Coir is one of the most popular inert mediums available on the market. Coco, as the name suggests, is made from coconut husks that have been chopped up into small bits.

    Pros:

    • Coco is environmentally friendly. Since it is made from coconut husks, it can be disposed of in compost.
    • Coco is easy to use, like soil, and can even be mixed with soil for a mix-and-match style of growing.
    • Coco is generally ready to go out of the bag, and will pour to meet its container’s size.

    Cons:

    • Not all Coco is made equal. Mixes of coco that are not made for professionals (Pro Mixes) may carry insects or microscopics that can cause issues. Don’t try to save an extra dime if it costs you your whole crop.
    • Coco has limited reusability. Because it is organic, it will tend to carry over nutrients, bacteria, and insects from the previous grow. Most professional growers will opt for a new batch of coco with every cycle, and the cost can add up with this. Some growers will reuse their coco and “flush” it, but over time the coco will become unusable.

    Peat


    Peat, short for peat moss, is an amendment made from sphagnum moss. While peat is generally not sold in its own right as a medium, it is commonly used as a blend or amendment in a large variety of other media.

    Pros:

    • Peat is organic, as it is made from moss. Can be composted or disposed of with minimal concern.
    • Peat retains water like a sponge, and can help moderate periods of drought or dryness in either a hydroponic or traditional grow.
    • Generally easy to work with, and mixes well with most mediums.

    Cons:

    • Because it is organic, it may need to be disposed of periodically. Reuse can gradually diminish its usefulness and even begin to host harmful microbes or insects.
    • While peat is great for water retention, this can become a serious problem if you overwater your plants. The peat will hold onto water for a very long time which can lead to other issues associated with overwatering.

    Perlite/Clay/Sand/Pebbles


    Essentially small rocks, perlite, clay, sand, and pebbles can all serve as a simple, cheap, and reusable media. The early days of hydroponics most frequently made use of these materials, and they are considered “classic” in the hydroponics worlds.

    Pros:

    • Reusable and cheap.
    • Generally clean, and comes in a wide variety of different sizes and shapes.
    • Only minimal work is required to prepare these materials.

    Cons:

    • Transplanting from these materials into a different media is not advisable. Due to their less-than-solid nature, a plant’s roots could be irreparably damaged if this media is disturbed too much.
    • Similarly, it’s recommended that these media are kept in a solid container made of hard plastic, metal, or ceramic. Cloth containers, soft plastic, or other soft containers could move the material and damage the plant’s roots.
    • Disposal of these materials may be tricky depending on how much of it you need to dispose of.

    Soil


    It’s worth mentioning our good old friend soil too. Not much else needs to be said, so here are the pros and cons.

    Pros:

    • Probably the cheapest and easiest medium to obtain. You can buy some virtually everywhere.
    • Easy to use.
    • Easy to dispose of or reuse.
    • Comes with its own nutrients.

    Cons:

    • Has the highest chance for pathogens or insects to be carried with it.
    • Takes up more space than most of the other mediums, and requires amending (or special potting soils) if you are growing indoors.
    • You have very little control over soil, other than adding things to it.

    Mixing and Matching


    Most growers we’ve spoken with often mix and match their mediums based on their needs. I alluded to this above when I was talking about cost and reusability:

    • Rockwool is great for transplanting from, as it retains its shape really well and keeps roots disease-free. However, it is the most expensive medium, so many growers choose to use it at the propagation stage only.
    • Coco and peat are great for stages when the plant is growing larger and you need more volume in your media. They’re relatively cheap and relatively clean, and best suited for early vegetative state all the way through flowering.
    • Perlite, clay, sand, and pebbles would be best-suited towards the middle or end of a plant’s lifespan, as transplanting from them is impractical, but they have many of the benefits of rockwool.
    • Soil is useful for the entirety of a plant’s lifespan, but carries a greater risk of disease and is harder to control.

    Conclusion


    That covers the bulk of media (pun intended) used in the cannabis industry. Is there a niche material you like to use? Let us know on the forum or in the survey below!


    Enjoyed the article? Want to continue the conversation?
    Join Now


    Do you want to receive the next Grower's Spotlight as soon as it's available? Sign up below!


    Do you have any questions or comments?

    Feel free to post below!


    About the Author

    Hunter Wilson is a community builder with Growers Network. He graduated from the University of Arizona in 2011 with a Masters in Teaching and in 2007 with a Bachelors in Biology.


    How Long is Cannabis Detectable in the Human Body?

    Do you want to be part of a private, professional community?
    Join Now

    One of our readers asked us this question, and we felt it was worth discussing! Please note that we are not doctors, and are making some educated guesses, so take everything with a grain of salt. We are not responsible for any poor choices you make!


    Ask anybody who is worried about drug testing and they’ll probably tell you that drug tests can detect cannabis for up to 6 months from ingestion. But how true is this? Is it just a common myth, or is there a thread of truth?

    To start off answering this question, we can actually use an article that Digamma Consulting published with us: “Smoking vs. Eating Cannabis: The Effects on Patient Health.” The article covers several of the primary metabolites involved in smoking/ingesting cannabis. These metabolites include:

    • THC - The primary psychoactive ingredient in cannabis
    • OH-THC - A metabolite produced by the human liver that is even more psychoactive than THC
    • THC-COOH - A THC metabolite that is not psychoactive, and lingers in the body.

    The metabolite most relevant to drug testing is THC-COOH. The other cannabinoids, THC and OH-THC, don’t persist in the human body for longer than a few hours, making them undetectable when you’re no longer under their effects. In any jurisdiction where cannabis is legal, the presence of THC-COOH is not considered indicative of impairment.


    The Persistence of THC-COOH


    So how long does THC-COOH persist in the body? Since this is the substance that many drug tests look for, it’s important to know if you’re worried about a drug test at your place of employment. After all, even in states where cannabis is legal, your employer can still fire you for cannabis use, as it cannabis use is not protected by law.

    If we look at detection levels in some drug tests, we find that the minimum threshold for detection of cannabinoids in the body is around 20 ng/mL of blood, or 20 nanograms. 20 nanograms is 0.02 micrograms.

    One particular study published on the NCBI states the following:

      “THC-COOH elimination half-lives were 5.2 (0.08) and 6.2 (6.7) days in frequent and infrequent users, respectively (21). After 5-mg intravenous THC-COOH to 10 non–cannabis users, terminal serum THC-COOH elimination half-life was 17.6 (5.5) h; however, monitoring was for only 4 days, potentially underestimating this parameter (34).”

    This establishes that the half-life of THC-COOH in the human body is around 5.2 to 6.2 days. Every 6.2 days, the human body should have removed at least half of what remains. The CDC provides a more liberal estimate, suggesting that over 90% of THC-COOH is eliminated from the body in the same time period, but for chronic users the THC-COOH can be stored in fat tissues for longer periods.

    Now we can do a napkin calculation with the numbers we have. The NCBI study delivered 20 milligrams of THC to users daily, so we’ll start with that number. The study reports that 24 hours after ingestion, blood THC-COOH levels were around 21 micrograms per liter. If we convert that to milliliters, that’s 0.021 micrograms per milliliter. Holy cow! In one day, we’re already at the minimum threshold for the drug screening test we described above. If we wait another week, we’ll be well below the threshold. A single half-gram joint could pass a drug screen within a week.

    But this makes a lot of assumptions:

    1. The NCBI study looked at blood levels of THC-COOH, not urine levels. Most drug tests require you to submit a urine sample, not a blood sample, and the THC-COOH likely was excreted via #1 or #2, to put it politely.
    2. The NCBI study did not examine fatty tissue in their subjects. In a one-time user, it’s unlikely that many cannabinoids would be stored in these fatty tissues, but they’re much more likely to persist in chronic users long after consumption. If you’re a regular user, your blood and urine levels could be much higher much longer.
    3. The absorption and metabolism rate of THC will vary by ingestion method and the individual. Some ingestion methods tend to persist longer (edibles), some are more efficient at THC delivery (vape). Individuals with slower metabolisms will likely take longer to process the THC as well.

    A very conservative “safe” estimate is that the THC-COOH from a single joint should be undetectable within two weeks for most people. However, if you’re a chronic user (pun intended), it will take significantly longer for your levels to drop below the threshold.


    What about CBD?


    The more astute among you probably noticed we have been almost exclusively talking about THC and THC-COOH. Good news, there’s studies on the metabolism of CBD as well.

    However, you may be missing the forest for the trees if you’re looking at the metabolism of CBD. The FDA recently announced that CBD is federally legal. In other words, should a drug screening detect CBD metabolites, there may not be a legal basis for firing. That said, some states allow firing for any reason.

    So let’s take a brief look at the metabolism of CBD and figure out what we can decipher. The first thing to look at is CBD itself. According to a study which gave subjects 10 mg of CBD per kilogram body weight per day for a week, blood plasma levels of CBD peaked at 11.2 nanograms per mL, well below the detection threshold we discussed above (20 nanograms/mL). The only study that shows CBD persisting longer than a day was a direct intravenous injection of 20mg of CBD, and that quickly dropped below detectable ranges within a few days.

    Additionally, we have to look at metabolites of CBD. Unlike THC which rather neatly metabolizes into only a few compounds, CBD can metabolize into many different compounds:

    You’ll notice that there’s about 12 different metabolites from CBD in the image above that showed concentrations greater than 1% in the NCBI study. The study identified at least 40 total different metabolites. However, the most abundant metabolite was 7-COOH-CBD and its derivatives.

    What I could decipher from the study is that these metabolites will generally exhibit at roughly the same rate as CBD (13.3% to 12.1%), meaning that these metabolites should generally be undetectable within a few days as well.


    Conclusion


    If you’re smoking a single joint with THC in it, you may be able to pass a drug test within a few weeks of use. However, if you’re a chronic chronic user (that’s not a typo), the secondary metabolites of cannabis may persist in your fat cells for a very long time, lending some credence to the “six months” idea.

    If you use exclusively CBD products, you should be able to pass most drug tests within a few days. CBD and its metabolites don’t persist in the body at high enough concentrations to reach the minimum thresholds for drug tests.

    So, did we get anything wrong? Did we forget something? Let us know in the comments or survey below!


    Enjoyed the article? Want to continue the conversation?
    Join Now


    Do you want to receive the next Grower's Spotlight as soon as it's available? Sign up below!


    Do you have any questions or comments?

    Feel free to post below!


    About the Author

    Hunter Wilson is a community builder with Growers Network. He graduated from the University of Arizona in 2011 with a Masters in Teaching and in 2007 with a Bachelors in Biology.


    Update on the STATES Act – Elizabeth Warren

    Do you want to be part of our private, professional community?
    Join Now

    Growers Network briefly touches upon some news regarding the STATES Act.


    In a previous article, we discussed the STATES Act and how it might be a path towards federal Cannabis legalization in the United States. Today we want to follow up that article with a bit of news that some of you may or may not have heard. The bill was originally introduced in the US Senate in June, 2018, by Senators Cory Gardner (R-CO) and Elizabeth Warren (D-MA).

    Recently, Elizabeth Warren announced that she has formed an exploratory committee towards running for the US presidency.


    What does an exploratory committee mean?


    For those not familiar with the presidential election process in the US, the formation of an exploratory committee is the first step towards a presidential bid. Essentially, an exploratory committee allows a potential candidate to “test the waters” and transition their financials in preparation for a bid.

    Under the rules of an exploratory committee, a potential nominee can use an exploratory committee to raise money over $5000 without needing to disclose their financial backers. Once a potential nominee has transitioned to a full-fledged nominee (no longer exploratory), they are required to disclose all financial sources.

    Now some of you might wonder: “If it’s exploratory, why is this big news?”

    Great question. The answer is that most politicians would never bother making an exploratory committee if they weren’t serious about the prospect in the first place. It’s very likely that anybody who has begun this process has consulted with numerous political experts and consultants prior to this announcement, and believes they may have a chance at winning the popular vote. The exploratory committee is really to see if the candidate would have enough financial support to make their bid successful. If a candidate can raise a healthy amount of money in the exploratory committee phase, it is extremely likely they will formally announce that they are running for the office.


    Ok, so what’s special about Elizabeth Warren?


    Growers Network is all about Cannabis. So why is Elizabeth Warren a big deal?

    Elizabeth Warren, along with Cory Gardner, introduced the STATES Act to the Senate. The STATES Act would functionally provide a route towards Cannabis legalization in the United States. Because Elizabeth Warren was one of the people who introduced the bill, she has a vested interest in seeing it succeed. Many political organizations often grade politicians based on how many of their introduced bills pass, which encourages politicians to write bills they believe in and believe will pass.

    Because of this, regardless of whether or not Elizabeth Warren makes it to the presidency, it is very likely she will make Cannabis legalization part of her campaign platform. This will bring the issue to the forefront of the political discussion, and may even help her in her election run. If she does make it to the presidency in 2020, then she can use political capital to push the issue even further. Presidents can exert very strong pressure on Congress.


    Elizabeth Warren’s Likely Platform


    Based on her announcement video, there are a few things we can clearly deduce being the basis of her platform:

    • An emphasis on improving conditions for the poor and middle class.
    • An emphasis on improving conditions for racial/ethnic minorities.
    • She wants to improve the healthcare system.
    • She wants to stop corruption.
    • She wants to protect the environment.

    There are also a few things implied in her video, even if not explicitly stated:

    • She is for gun control.
    • She is pro LGBTQ.
    • She has a populist ideology and strongly supports the 1st amendment.
    • She criticizes Fox News and certain politicians and pundits who are shown in her video.

    Also, we already know a few things based on her behavior as a senator:

    • As long as she’s been a politician, she has been a Democrat.
    • She has voted for members of both parties, often emphasizing that she believes neither party should dominate.
    • She was one of the driving forces behind the creation of the Consumer Financial Protection Bureau (CFPB), a government agency with the goal of preventing anti-consumer practices by large corporations. She played a major role in the passage of Dodd-Frank, which established the CFPB.
    • She has a history of progressive and populist politics, often targeting Wall Street financiers and bankers who played a role in the 2007-2008 economic crisis.
    • She will likely run on her background as a law school professor who extensively studied topics such as bankruptcy, economics, and commercial law.

    Conclusion


    That’s about it for our update. While we will never tell you whom to vote for, we will point out politicians who go the extra mile when it comes to Cannabis. And this politician is worth keeping an eye on!


    Enjoyed the article? Want to continue the conversation?
    Join Now


    Do you want to receive the next Grower's Spotlight as soon as it's available? Sign up below!


    Do you have any questions or comments?

    Feel free to post below!


    About the Author

    Hunter Wilson is a community builder with Growers Network. He graduated from the University of Arizona in 2011 with a Masters in Teaching and in 2007 with a Bachelors in Biology.