This is the third in a series of articles designed to introduce an integrated pest management framework for cannabis cultivation facilities. To see Part One, click here. For Part Two, click here. Part Four comes out next week and covers direct control options for pest reduction. More to come!
This is Part 3: Preventive Measures
Preventive measures are a great investment in the profitability of your operations. Our objective is to ensure successful repeat harvests forever. Build your procedures with this in mind. This means maintenance and regular review. We all realize that this work can be monotonous drudgery (we know!), but these procedures will ensure your success.
Figure 1: New Air Shower Access Installation
As a summary to begin, pest access must be limited wherever possible. Employees are the first place to start, but we must also return to our site map and review our facility design and workflows. Every operation has to move plants from nursery through harvest and post-harvest. Where should cleaning happen? Of course, you have to clean up post-harvest but when should this occur during the grow cycle? What is the best way to monitor and clean environmental management systems (i.e. air, water) and what are the weaknesses in the physical barriers between operations? Let’s walk through these issues one-by-one.
Employee Access and Sterile Equipment
Follow procedures to screen and protect your employees both to eliminate pests and to avoid exposing your employees to harmful chemicals or storage areas. Look for ways to isolate your workflow from pest access. Be certain that your facility is airtight and sealed with filtration of molds, spores and live organisms in your air intake areas. Air showers at your access points are important to screen your employees on their way into your gowning areas and grow facility. Clothing should be standardized and shoe coverings or crocs should be provided for all employees that access your interior. Look for ways to stop all pests (embedded, crawling, hopping or flying) in all of your room assignments (mothers, clone, veg, flower, trim and drying). This can be improved with shoe baths, sticky mats, frequent hygiene (hand washing and cleaning stations) and procedures for entry.
Always consider requiring hair & beard nets, shoe covers and disposable gloves in plant sensitive areas.
Chemical Access & Protective Equipment
Figure 2: Example Facility Map – Understand Workflow & Barriers to Pest Access
Personal protection equipment (PPE) is very important to protect any employee that will come in contact with materials, liquids or vapors for chemical resources. Establish procedures for chemical use and train employees in the safe handling of these materials. Typical equipment includes high density chemical protective gloves, boots, respirators, Tyvek (or equivalent protective wear) suits and eye protection or goggles.
Chemical access areas and their use should be restricted to employees familiar with their authorized application. Always remember that cannabis is an accumulator plant, and it will absorb and hold onto chemical treatments. Appropriate isolation and safety procedures must be followed for chemical use. Not following these restrictions can expose your employees to dangerous chemicals or get your entire harvests rejected at testing.
Facility Map & Workflow
Because insects would like to be everywhere and they come in many types (root zone, crawling, flying, microscopic, bacterial or biofilm), the facility workflow must understand where they are and how they might migrate if they penetrate your defenses. Note airflows in your rooms and fan locations so migrations can be predicted once an infestation is located. Where are your opportunities for full clean-up and disaster recovery in your building? Where should you stage maintenance filters, test kits, water and cleaning materials. How best to clean up and dispose of sealed garbage containers or cleaning materials?
Operational Cleaning & Post-Harvest Reset
When compiling your preventative measure documents, it is critical to create a repeatable operating procedure for cleaning and sanitizing your rooms, systems, and growing spaces after each harvest. Plant material handling, cleaning surfaces and wipe methods should all be documented in your Standard Operating Procedures (SOPs). Define what “clean” is. Removing plants and plant debris is pretty clear but define how to drain reservoirs, clean pipes, change filters and clean and sterilize your rooms. Operators must be trained in these SOPs and reminded of their content on a regular schedule. This is how you avoid outbreaks that can crush your profits.
Physical Barriers & Maintenance
Figure 3: HVAC Air Filtration, Dehumidification, & Air Movement, Onyx Agronomics
Document your sealed spaces and define your normal room and access door barrier interfaces. Review the status of any known cracks or gaps in your perimeter. Are there any known leaks or piping that has been seen as a risk or a problem in the past? Are there any discoloring or resident mold locations (Never happens, right?). Baseline how much time and people resource a harvest operation and cleaning effort should take. Will you do this after every harvest or compromise your risk by delaying to every third or fourth harvest? Create your barrier SOP.
Environmental Control & HVAC
Managing the air quality provided to your plants is critical to your yields. Controlling CO2, air movement rates (the leaf happy dance), humidity, air filtration and sterilization methods must be maintained and cleaned on a regular basis. Do you need to change the HEPA or other particulate filters? Is there any UV light sterilization maintenance? We have all seen the home HVAC air conduit cleaning commercials. Your commercial facility is no different. How will you clean your air and water plumbing systems? How often will you perform this full reset? When will you calibrate and data log your sensors for temperature, humidity, CO2 and water resources? Put everything about your environmental set points into your maintenance document and decide when to validate these. Molds, mildews and biofilm hazards are all waiting for unmonitored systems to open the door for access.
In Conclusion, This Week
If you’re an IPM nerd and this dynamic topic did not put you to sleep, you can read more detail and examples for your integrated pest management procedures in ourcomplete white paper for Integrated Pest Management Recommendations, download the document here.
In our next chapter, Direct Control Options, we will review what you can use to protect or recover control of your facility including both chemical and non-chemical tools and methods. In our final two chapters, we will discuss extermination of the determined pests that breach your defenses. And with great expectations, our final chapter will discuss emergency response and time to go to war!
Part Four comes out next week. See you again soon!
Flower continues to be the dominant product category in US cannabis sales. In this “Flower-Side Chats” series of articles Green interviews integrated cannabis companies and flower brands that are bringing unique business models to the industry. Particular attention is focused on how these businesses navigate a rapidly changing landscape of regulatory, supply chain and consumer demand.
Connected is a vertically-integrated cannabis company based out of Sacramento, CA and one of the most sought-after brands in California and Arizona. Having formed as a legacy operation in 2009, Connected has created a cult-like following over more than a decade in business. According to BDS Analytics, Connected Cannabis and their acquired brand Alien Labs now boasts the highest wholesale flower price in any major legal market – their average indoor flower wholesale price is 2x the CA average – yet also has the highest flower retail revenue.
We spoke with Sam Ghods, CEO of Connected to learn more about his transition from tech to cannabis, how Connected thinks about product and his vision for future growth. Sam joined Connected in 2018 after getting to know the founders. Prior to Connected, Sam was a co-founder at Box where he stayed on for 3 years after their successful IPO.
Aaron Green: How did you get involved in the cannabis industry?
Sam Ghods: I originally came from the tech industry. I co-founded Box, a cloud sharing and storage company, in the mid 2000s with three other friends. We grew that from the four of us to eventually a multi-billion-dollar public offering in 2015. I stayed on a few more years after that until I took some time off trying to decide what I wanted to do next. I looked at a number of different industries and companies, but personally I always had a real passion for artisan and craft consumer goods. It’s a really big hobby of mine. Whether it’s going to Napa or learning about different kinds of premium consumer goods, I really had a deep love and never knew cannabis could be like that.
When I first met Caleb, the co-founder of Connected, he instantly got my attention by telling me that they had been selling out of their product in the volume of millions of dollars a year at more than two times what everybody else was selling for. That really piqued my interest because creating a product that has that level of consumer passion and demand is maybe the single hardest thing about building a consumer goods business. For them to have been so successful in what was a very difficult and gray market to operate in at the time – this was mid 2018 that I was speaking with him and he had been building this company since 2009 – is a really big challenge, and really impressive.
Sam Ghods, CEO of Connected
So, I started spending time with Caleb and the Connected team and learned a lot about the business. Everything I learned got me more interested and more excited. The way that they thought about the product, the way they treated it was with a reverence and level of sophistication I had no idea was possible.
I was so excited to just learn about the space. I mean, honestly, it feels like the internet in the 90’s- The sheer possibility and excitement. The only difference here is that the market already has existed for 100 years plus: the gray and underground markets for this product are actually phenomenally mature. And now we’re lifting up billions of dollars in commerce that’s already occurring and attempting to legalize all of it in one fell swoop, which creates such an interesting set of challenges.
I first got involved as an advisor on fundraising and strategy. And then a few months later, they were looking for a CEO and I joined full time as CEO in September 2018.
Aaron: What trends in the industry are you focused on?
Sam: It may seem basic, but I think product quality in the broader cannabis markets nationally and internationally is really underrated. Because of the extreme weight of the regulatory frameworks in so many different markets, it’s resulting in a lot of product being grown and sold just because it can be by the operators that are doing it. In many markets, they count the number of producers by the handful, instead of being measured in hundreds or thousands like in California or Oregon. And in that kind of environment, you’re not really having competition, and you’re not really able to see the quality that has existed in this category for years and years and years.
That’s one of the things that really sets us apart – the quality is first above all else, as well as the innovation and time that has gone into it, and not many existing brands in the legal market can say that. With some of the “premium” brands on the market, it would be comparable to just jumping into the wine industry one day and thinking that you can become a premium brand, without having any knowledge of the history of the product or the industry itself. At Connected, we have a team that’s been doing this for over a decade. We did a back of the envelope calculation: there’s over one thousand lifetime harvests between our team. We’ve also brought in specialists from Big Ag and other industries to complement that experience.
Cannabis is a very, very difficult plant to grow at a very high level. It’s much more like high-end wine or spirits than other fruit or produce. I think in the cannabis community, that’s extremely acknowledged, and appreciation for that is the reason we get by with the highest prices in the legal market. I think in the broader investor and financial community, this point hasn’t really hit home, because the limited license markets aren’t mature enough, and there isn’t enough competition in many of them.
Our focus is continuing to make the best product we can, which has fed and developed our brands [Connected and Alien Labs] into what they are today. That is our number one focus, and we think it’s pretty unique to the space of not just cultivating a great quality product, but also as far as breeding, pushing the bar higher and higher on what can be done with the genetics of the plant.
Aaron: How do you think about choosing testing labs?
Sam: So, the number one criterion is responsibility and compliance. We must be completely confident that they’re testing accurately, safely and exactly to the specifications of the state. Then from there, it is really cultivating about a partnership. There’s a lot of nuance in the relationship with a testing lab. We note things like: Are they responsive? Are they sensitive to our needs in terms of either timelines or requirements we have? It does come down to timelines and costs to a certain extent, like who’s able to deliver the best service for the best cost, but it really is a partnership where you’re working together to deliver a great product. Reliability and consistency are big pieces as well.
Aaron: Industry estimates for illicit market activities are something like 60% of the California market. From your perspective, how do we fix that?
Sam: I think it probably comes down to funding for the efforts to discontinue those activities and opening up the barrier to entry, incentivizing “illegal” operators to make the investment in the cross-over. I think the most successful attempts to tamp it down was when there were initiatives that were well-orchestrated and well-funded, allowing for legacy growers to actually cross over to the “legal” industry. You can’t launch an industry with such an extreme amount of regulation, set a miles-high barrier to entry, and then penalize legacy growers for continuing their business as-is. If the illicit market continues to be fueled by rejection, you’re not going to achieve the tax revenue that you’re expecting to see, that we all want to see. There needs to be an attitude that every dollar put into transitioning illicit markets into regulated markets is returned many times over in tax revenue to the state’s citizens.
Aaron: So, I understand you sell wholesale. Do you sell direct to consumer?“Once they hit the shelves, we blow people away again, beyond their expectations of what they had before.”
Sam: We own and operate three retail stores, so we do sell direct to our consumers, but at this point the majority of our product is sold through third party dispensaries.
Aaron: Do you make fresh frozen?
Sam: We do. On the cultivation side we have indoor, mixed light and outdoor. We fresh freeze a portion of our outdoor harvest every year, and then we use that fresh frozen for our live resin products, for example, our recent live resin cartridge. It creates a vape experience really unlike any other because we are using our regular market-ready flower, but instead we’re taking that flower and actually extracting, not just using the distillate and mixing a batch of terpenes with it. We extract the entire plant’s content across the board, from cannabinoids to terpenoids and everything in between, and then you have our live resin cartridges.
Aaron: How do you think about brand identity and leveraging the brand to command higher prices?
Sam: The cycle we’ve effectively created is that every time we do a release of a new strain or a new batch or harvest, the quality is generally going up. That quality is released under our brands, and then the customer is able to associate that increase in quality and reputation with those brands. Then for our next launch, we have an even bigger platform to talk about the products and to ship and distribute and sell the products. Once they hit the shelves, we blow people away again, beyond their expectations of what they had before. That continuous cycle keeps fortifying the brand and fortifying the product. From our perspective the brand is built 100% on the quality of the product. The product will always be our highest priority and the brand will come downstream from that.
Aaron: Tell me about Alien Labs.
Sam: Alien Labs was an acquisition. It was a company that had built their brand really successfully in the gray market through 2017 and Prop 215 in California and had an incredible level of quality, a really loyal and dedicated fan base, not to mention a tremendous Instagram presence and following, which is where 98% of cannabis marketing happens today. We really loved the spirit of what the founders were bringing to the table. In 2018, we decided basically to join forces with them and bring them on board, creating a partnership where they leverage our infrastructure and the systems and processes we’ve built, but still keep their way of cultivation and their product vision. To this day, Ted Lidie, one of the founders, continues as the lead brand director for Alien Labs.
Aaron: In what geographies do you currently operate?
Sam: Our primary offices and facilities are based out of Sacramento, California, but we have facilities throughout the state. Last year, for the first time we launched operations in a new state, Arizona. As you may know, you’re not allowed to take cannabis products across state lines at all, so if you want consistent product in multiple markets you really have no choice but to rebuild your entire infrastructure in each state you want to open up.
There are many brands that are expanding and launching in more markets more quickly, but they’re doing so by taking product that’s already existing and putting their brand name on it. That is something we’ve decided strategically that we will not do. We’ve spent years building a high level of trust with our customers, so we’re only going to put our brand name on products that are our genetics, our cultivation, our style, our quality of product. When we launched in Arizona, we did it with a facility that we leased and took over and now operate with our staff. We’re replicating the same exact product that you can get in California in Arizona, which is really exciting.
We launched just this past November, which has been incredibly successful. Our dispensary partner Harvest saw lines of dozens of people out the door.“We consider ourselves a flower company first and foremost, so for us, that was a very calculated strategic move.”
Aaron: Any new geographies on the horizon that you can talk about?
Sam: We’re constantly evaluating new opportunities. I don’t have anything particularly specific to announce right now, but I will say we look for states where we believe there’s a competitive environment where the product quality is going to really stand out and be appreciated.
Aaron: Do you notice any differences in consumer trends between California and Arizona that stand out?
Sam: Not too many yet. We don’t have a retail location in Arizona, so we don’t have as much direct contact. However, we have heard consistently that the Connected customer demographics – as you would imagine most interested in our product – are those looking for something special, unique, different and have a really superior quality to everything else out there. We ended up launching in Arizona with the highest price point for flower in the state, and we say that’s just the beginning. The market is still so young and immature, both nationally and internationally, that this category is going to develop into one that’s really taste-driven.
Aaron: What’s next in California?
Sam: Continued growth and product development. We want to keep blowing away our customers with more and more incredible products, different product types and categories. For example, the cartridges were a really big launch for us because we don’t really consider ourselves a vape company. We consider ourselves a flower company first and foremost, so for us, that was a very calculated strategic move. We were only going to launch the product if we could fully replicate what the consumer gets from the flower experience. We are very unlikely to ever release a distillate pen, for example.
Aaron: What are you personally interested in learning more about?
Sam: We, as a society, really don’t know very much about the cannabis plant. Pretty much all meaningful research around cannabis stopped in the early 1900’s with prohibition. In the meantime, we’ve performed millions of dollars of studies and research on almost every other plant that we grow commercially. We understand these plants extraordinarily well. Cannabis science is stuck back in agriculture of early 1900s. The most interesting conversations I have are around how the plant works, how it doesn’t work and the ways in which it is so different from all other plants with which we are familiar. Our head of cultivation comes from Driscolls, the largest berry company in the world, and even he is frequently surprised by the way the cannabis plant reacts to things that are commonly understood in other plants. So, the way the actual plant responds to different environments is truly fascinating and something I think we’ll be learning about for decades and decades to come.
Aaron: Okay, great. That concludes the interview. Thank you, Sam!
For years we have heard about and sometimes experienced, white powdery mildew when growing cannabis. It is a problem we can see, and we have numerous ways to combat it. But now more and more states are introducing regulatory testing on our harvests and they are looking for harmful substances like Escherichia coli., Aspergillis Fumigatus, Aspergillis terreus, … just to name a few. Mycotoxins, mold and bacteria can render a harvest unusable and even unsellable- and you can’t see these problems with the naked eye. How much would it cost you to have to throw away an entire crop?
You bring in equipment to control the humidity. You treat the soil and create just the right amount of light to grow a superior product. You secure and protect the growing, harvesting, drying and production areas of your facility. You do everything you can to secure a superior yield… but do you?
Many of the organisms that can hurt our harvest are being multiplied, concentrated and introduced to the plants by the very equipment we use to control the growing environment. This happens inherently in HVAC equipment.
Your air conditioning equipment cools the air circulating around your harvest in a process that pulls moisture from the air and creates a perfect breeding ground in the wet cooling coil for growth of many of the organisms that can destroy your yield. As these organisms multiply and concentrate in the HVAC system, they then spew out into the very environment you are trying to protect at concentrated levels far greater than outside air. In effect, you are inoculating the very plants you need to keep safe from these toxins if you want to sell your product.
The cannabis industry is starting to take a page from the healthcare and food safety industries who have discovered the best way to mitigate these dangers is the installation of a proper UVC solution inside their air conditioning equipment.
Why? How does UVC help? What is UVC?
What is Ultraviolet?
Ultraviolet (UV) light is one form of electromagnetic energy produced naturally by the sun. UV is a spectrum of light just below the visible light and it is split into four distinct spectral areas – Vacuum UV or UVV (100 to 200 nm), UVC (200 to 280 nm), UVB (280 to 315 nm) and UVA (315 to 400 nm). UVA & UVB have been used in the industry to help promote growth of cannabis.
What is UVC (Ultraviolet C)?
The entire UV spectrum can kill or inactivate many microorganism species, preventing them from replicating. UVC energy at 253.7 nanometers provides the most germicidal effect. The application of UVC energy to inactivate microorganisms is also known as Germicidal Irradiation or UVGI.
UVC exposure inactivates microbial organisms such as mold, bacteria and viruses by altering the structure and the molecular bonds of their DNA (deoxyribonucleic acid). DNA is a “blue print” these organisms use to develop, function and reproduce. By destroying the organism’s ability to reproduce, it becomes harmless since it cannot colonize. After UVC exposure, the organism dies off leaving no offspring, and the population of the microorganism diminishes rapidly.
Ultraviolet germicidal lamps provide a much more powerful and concentrated effect of ultraviolet energy than can be found naturally. Germicidal UV provides a highly effective method of destroying microorganisms.
To better understand how Steril-Aire UVC works, it is important to understand the recommended design. Directed at a cooling coil and drain pan, UVC energy destroys surface biofilm, a gluey matrix of microorganisms that grows in the presence of moisture. Biofilm is prevalent in HVAC systems and leads to a host of indoor air quality (IAQ) and HVAC operational problems. UVC also destroys airborne viruses and bacteria that circulate through an HVAC system and feed out onto the crop. HVAC cooling coils are the largest reservoir and amplification device for microorganisms in any facility.
For the most effective microbial control, UV germicidal Emitters are installed on the supply side of the system, downstream from the cooling coil and above the drain pan. This location provides more effective biofilm and microbial control than in-duct UVC installations. By irradiating the contaminants at the source – the cooling coils and drain pans – UVC delivers simultaneous cleaning of surface microorganisms as well as destruction of airborne microorganisms and mycotoxins. Steril-Aire patented this installation configuration in 1998.
The recirculating air in HVAC systems create redundancy in exposing microorganisms and mycotoxins to UVC, ensuring multiple passes so the light energy is effective against large quantities of airborne mycotoxins and cleaning the air your plants live by.
Where are these mycotoxins coming from?
Aspergillus favors environments with ample oxygen and moisture. Most pre-harvest strategies to prevent these mycotoxins involve chemical treatment and are therefore not ideal for the cannabis industry.
Despite the lack of cannabis protocols and guidelines for reducing mycotoxin contamination, there are some basic practices that can be utilized from other agricultural groups that will help avoid the production of aflatoxins and ochratoxins.
When guidelines are applied correctly to the cannabis industry, the threat of aflatoxin and ochratoxin contamination can be significantly reduced. The place to start is a clean air environment.
Design to win
The design of indoor grow rooms for cannabis is critical to the control of airborne fungal spores and although most existing greenhouses allow for the ingress of fungal spores, experience has shown that they can be retrofitted with air filters, fans, and UVC systems to make them relatively free of these spores. Proper designs have shown clearly that:
Prevention via air and surface disinfection using germicidal UVC is much better than chemical spot treatment on the surface of plants
High levels of air changes per hour enhance UVC system performance in reducing airborne spores
Cooling coil inner surfaces are a hidden reservoir of spores, a fertile breeding ground and constitute an ecosystem for a wide variety of molds. Continuous UVC surface decontamination of all coils should be the first system to be installed in greenhouses to reduce mildew outbreaks.
UVC can virtually eliminate airborne contaminants
Steril-Aire graphic 4
Steril-Aire was the first and is the market leader in using UVC light to eliminate mold and spores to ensure your product will not be ruined or test positive.
Mold and spores grow in your air handler and are present in air entering your HVAC system.
Steril-Aire UVC system installs quickly and easily in your existing system.
The Steril-Aire UVC system destroys up to 99.999% of mold/spores.
Plants are less likely to be affected by mold…with a low cost and no down time solution.
It’s time to protect your harvest before it gets sick. It’s time to be confident your yield will not test positive for the contaminants that will render it unusable. It’s time to win the testing battle. It’s time for a proper UVC solution to be incorporated throughout your facilities.
By Dr. Allison Justice, Vice President of Cultivation at Outco
This presentation discusses:
Prized French wines are aged for years in oak barrels, as are famous whiskies. Tobacco is air-, fire-, flue- or sun-cured. Cannabis, however, is quickly dried and stored in a plastic bucket. Although many cannabis growers have proprietary ways of making flower flavorful and aromatic, little to no research is available for consistency.
Anecdotal examples show that chemical makeup is not only dictated by the strain/cultivar, but also influenced by grow methods, drying and curing. The lack of data prompted us to research what is happening during these processes. In this session, we will present our research at OutCo of how to affect and control the chemical makeup of flower; new protocols to monitor the dry and cure of cannabis flowers so we are able to modulate the terpene and cannabinoid profiles in our strain offering; and our latest findings in this exciting field of post-harvest cannabis research.
As the cannabis industry in the United States and throughout the world develops, the market is getting more competitive. Markets in a number of states are experiencing disruptions that will have lasting effects for cultivators, including oversupply and supply chain bottlenecks. Now more than ever, growers need to look for ways to differentiate their product or gain a bigger market share. Looking at yield efficiency, quality improvements and analyzing the cost of inputs versus value of the crop can help growers make the right choices in technology for lighting, irrigation and pest control among other technologies.
Adam Jacques, co-founder of Growers’ Guild Gardens and Sproutly
A series of free webinars in two weeks can help growers learn about some of the more advanced techniques in improving yield and quality. The Cannabis Cultivation Virtual Conference on May 23rd will explore a variety of tips and tricks for taking their cultivation operation to the next level. This event is free to attendees, made possible by sponsors VividGro and CannaGrow Expo.
Dr. Allison Justice, vice president of cultivation at Outco
Attendees will hear from experts in cannabis cultivation on a range of topics, including breeding, drying, curing, environmental monitoring and micropropagation. Adam Jacques, co-founder of Growers’ Guild Gardens and Sproutly, will discuss some of his experience with breeding high-CBD strains in Oregon. His talk will delve into some of the proper breeding procedures, along with how to hunt for particular phenotypes and developing specific cannabinoids and terpenes.
Dr. Allison Justice, vice president of cultivation at Outco, is going to present some of her findings in drying and curing at the company. She plans on sharing her research on how the post-harvest stages can affect and control the chemical makeup of flower. She’ll also discuss some new protocols to monitor the dry and cure of cannabis flowers so we are able to modulate the terpene and cannabinoid profiles.
Regardless of whether your grow is indoor or in a greenhouse, mold is a factor that all cultivators must consider.
Photo credit: Steep Hill- a petri dish of mold growth from tested cannabis
After weeks of careful tending, pruning and watering to encourage a strong harvest, all cultivators are looking to sell their crop for the highest market value. A high mold presence, measured through a total yeast and mold count (TYMC), can cause a change of plans by decreasing crop value. But it doesn’t have to.
There are simple steps that any cultivator can take that will greatly eliminate the risk of mold in a grow. Below are some basic best practices to incorporate into your operation to reduce contaminants and mold growth:
Isolate dirty tasks. If you are cleaning pots, filling pots or scrubbing trimming scissors, keep these and other dirty tasks away from grow and process areas. Dirty tasks can contaminate the grow area and encourage mold growth. Set up a “dirty room” that does not share heating, ventilation and air conditioning with clean areas.
Compartmentalize the grow space. Mold can launch spores at speeds up to 55 miles per hour up to eight feet away without any air current. For this reason, if mold growth begins, it can become a huge problem very quickly. Isolate or remove a problem as soon as it is discovered- better to toss a plant than to risk your crop.
No drinks or food allowed. Any drinks or food, with the exception of water, are completely off limits in a grow space. If one of your employees drops a soda on the ground, the sugars in the soda provide food for mold and yeast to grow. You’d be surprised how much damage a capful of soda or the crust of a sandwich can do.
Empty all trash daily. Limiting contaminants in turn limits the potential for issues. This is an easy way to keep your grow clean and sterile.
Axe the brooms. While a broom may seem like the perfect way to clean the floor, it is one of the fastest ways to stir up dirt, dust, spores and contaminants, and spread them everywhere. Replace your brooms with hepa filter backpack vacuums, but be sure that they are always emptied outside at the end of the work day.
No standing water or high humidity. Mold needs water to grow, therefore standing water or high humidity levels gives mold the sustenance to sporulate. Pests also proliferate with water. Remove standing water and keep the humidity level as low as possible without detriment to your plants.
Require coveralls for all employees. Your employee may love his favorite jean jacket, but the odds are that it hasn’t been cleaned in months and is covered with mold spores. Clean clothing for your staff is a must. Provide coveralls that are washed at least once a week if not daily.
Keep things clean. A clean and organized grow area will have a huge impact on mold growth. Clean pots with oxidate, mop floors with oxidate every week, keep the areas in front of air returns clean and clutter-free, and clean floor drains regularly. The entire grow and everything in it should be scrubbed top to bottom after each harvest.
Keep it cool. Keep curing areas cool and storage areas cold where possible. The ideal temperature for a curing area is roughly 60 degrees and under 32 degrees for a storage area. Just like food, the lower the temperature, the better it keeps. High temperature increases all molecular and biological activity, which causes things to deteriorate faster than at cooler temperatures. However, curing temperature is a function of water activity more than anything.
Be Careful With Beneficials. Beneficial insects certainly have their place in the grow environment. However, if you have a problem with mold on only a small percentage of plants, any insect can act as a carrier for spores and exacerbate the problem. By the same token, pests spread mold more effectively than beneficials because they produce rapidly, where beneficials die if there aren’t pests for them to eat. It is best to use beneficials early in the cycle and only when necessary.
I have been studying microorganisms for over 35 years, and the elusive critters still fascinate me! Here in Microbiology 101, I write about the foundation of knowledge on which all microbiologists build. You may have a general interest in microbiology or have concerns in your operation. By understanding microbiology, you understand the diversity of microorganisms, their source, control of microorganisms and their importance.
Part 1
The term microbiology covers every living being we cannot see with the naked eye. The smallest microbe is a virus. Next in size are the bacteria, then yeast and mold cells, and the largest microbes are the protozoans. The tiny structure of a virus may be important in the plant pathology of cannabis, but will not grow in concentrates or infused products. A virus is not living, until it storms the gate of a living cell and overtakes the functions within the cell. Viruses are the number one cause of foodborne illness, with the number one virus called Norovirus. Think stomach flu. Think illness on cruise ships. Viruses are a food service problem and can be prevented by requiring employees to report sickness, have good personal hygiene including good hand washing, and, as appropriate, wear gloves. Following Good Manufacturing Practices (GMPs) is critical in preventing the transfer of viruses to a product where the consumer can be infected.
The petri dishes show sterilization effects of negative air ionization on a chamber aerosolized with Salmonella enteritidis. The left sample is untreated; the right, treated. Photo courtesy of USDA ARS & Ken Hammond
The largest microbial cell is the protozoan. They are of concern in natural water sources, but like viruses, will not grow in cannabis products. Control water quality through GMPs, and you control protozoans. Viruses and protozoans will not be further discussed here. Bacteria, yeast and mold are the focus of further discussion. As a food microbiologist, my typical application of this information is in the manufacturing of food. Because Microbiology 101 is a general article on microbiology, you can apply the information to growing, harvesting, drying, manufacture of infused products and dispensing.
It is not possible to have sterile products. Even the canning process of high temperature for an extended time allows the survival of resistant bacterial spores. Astronauts take dehydrated food into space, and soldiers receive MREs; both still contain microbes. Sterility is never the goal. So, what is normal? Even with the highest standards, it is normal to have microbes in your products. Your goal is to eliminate illness-causing microorganisms, i.e. pathogens. Along the way, you will decrease spoilage microbes too, making a product with higher quality.
Petri dish containing the fungus Aspergillus flavus. It produces carcinogenic aflatoxins, which can contaminate foods and cause an invasive fungal disease. Photo courtesy of USDA ARS & Peggy Greb.
Yeast and mold were discussed on CIJ in a previous article, Total Yeast & Mold Count: What Cultivators & Business Owners Need to Know. Fuzzy mold seen on the top of food left in the refrigerator too long is a quality issue, not a safety issue. Mold growth is a problem on damaged cannabis plants or cuttings and may produce mycotoxin, a toxic chemical hazard. Following Good Agricultural Practices (GAPs) will control mold growth. Once the plant is properly dried, mold will not grow and produce toxin. Proper growing, handling and drying prevents mycotoxins. Like mold, growth of yeast is a quality issue, not a safety issue. As yeast grow, they produce acid, alcohol and carbon dioxide gas. While these fermentation products are unwanted, they are not injurious. I am aware that some states require cannabis-infused products to be alcohol-free, but that is not a safety issue discussed here.
What are the sources of microorganisms?
People. Employees who harvest cannabis may transfer microorganisms to the plant. Later, employees may be the source of microbes at the steps of trimming, drying, transfer or portioning, extract processing, infused product manufacture and packaging.
Ingredients, Supplies and Materials. Anything you purchase may be a source of microorganisms. Procure quality merchandise. Remember the saying, “you get what you pay for.”
Environment. Starting with the outdoors, microbes come from wind, soil, pests, bird droppings and water. When plants are harvested outdoors or indoors, microbes come from the tools and bins. Maintain clean growing and harvesting tools in good working condition to minimize contamination with microbes. For any processing, microbes come from air currents, use of water, and all surfaces in the processing environment from dripping overhead pipes to floor drains and everything in between.
In Part 2 I will continue to discuss the diversity of microorganisms, and future articles will cover Hazard Analysis and Critical Control Points (HACCP) and food safety in more detail. What concerns do you have at each step of operations? Are you confident in your employees and their handling of the product? As each state works to ensure public health, cannabis-infused products will receive the same, if not more, scrutiny as non-cannabis food and beverages. With an understanding and control of pathogens, you can focus on providing your customers with your highest quality product.
Hazard analysis and critical control points (HACCP) is a robust management system that identifies and addresses any risk to safety throughout production. Originally designed for food safety through the entire supply chain, the risk assessment scheme can ensure extra steps are taken to prevent contamination.
The FDA as well as the Food Safety and Inspection Service currently require HACCP plans in a variety of food markets, including high-risk foods like poultry that are particularly susceptible to pathogenic contamination. As California and other states develop and implement regulations with rigorous safety requirements, cannabis cultivators, extractors and infused product manufacturers can look to HACCP for guidance on bolstering their quality controls. Wikipedia actually has a very helpful summary of the terms referenced and discussed here.
Dr. Markus Roggen, vice president of extraction
The HACCP system consists of six steps, the first of which being a hazard analysis. For Dr. Markus Roggen, vice president of extraction at Outco, a medical cannabis producer in Southern California, one of their hazard analyses takes place at the drying and curing stage. “When we get our flower from harvest, we have to think about the drying and curing process, where mold and bacteria can spoil our harvest,” says Dr. Roggen. “That is the hazard we have to deal with.” So for Dr. Roggen and his team, the hazard they identified is the potential for mold and bacteria growth during the drying and curing process.
The next step in the HACCP system is to identify a critical control point. “Correct drying of the flower will prevent any contamination from mold or bacteria, which is a control point identified,” says Dr. Roggen. “We also have to prevent contamination from the staff; it has to be the correct environment for the process.” That might include things like wearing gloves, protective clothing and hand washing. Once a control point is identified, the third step in the process is to develop a critical limit for those control points.
A critical limit for any given control point could be a maximum or minimum threshold before contamination is possible, reducing the hazard’s risk. “When we establish the critical limit, we know that water activity below 0.65 will prevent any mold growth so that is our critical limit, we have to reach that number,” says Dr. Roggen. The fourth step is monitoring critical control points. For food manufacturers and processors, they are required to identify how they monitor those control points in a written HACCP plan. For Dr. Roggen’s team, this means using a water activity meter. “If we establish the critical control point monitoring, water activity is taken throughout the drying process, as well as before and after the cure,” says Dr. Roggen. “As long as we get to that number quickly and stay below that number, we can control that point and prevent mold and bacteria growth.”
One of the cultivation facilities at Outco
When monitoring is established and if the critical limit is ever exceeded, there needs to be a corrective action, which is the fifth step in a HACCP plan. In Dr. Roggen’s case, that would mean they need a corrective action ready for when water activity goes above 0.65. “If we don’t have the right water activity, we just continue drying, so this example is pretty simple,” says Dr. Roggen. “Normal harvest is 7 days drying, if it is not dry enough, we take longer to prevent mold or bacteria growth.”
The sixth step is establishing procedures to ensure the whole system works. In food safety, this often means requiring process validation. “We have to double check that our procedure and protocols work,” says Dr. Roggen. “Checking for water activity is only a passive way of testing it, so we send our material to an outside testing lab to check for mold or bacteria so that if our protocols don’t work, we can catch those problems in the data and correct them.” They introduced weekly meetings where the extraction and cultivation teams get together to discuss the processes. Dr. Roggen says those meetings have been one of the most effective tools in the entire system.
Dr. Roggen’s team identified worker safety as a potential hazard
The final step in the process is to keep records. This can be as simple as keeping a written HACCP plan on hand, but should include keeping data logs and documenting procedures throughout production. For Dr. Roggen’s team, they log drying times, product weight and lab tests for every batch. Using all of those steps, Dr. Roggen and his team might continue to update their HACCP plans when they encounter a newly identified hazard. While this example is simplistic, the conceptual framework of a HACCP plan can help detect and solve much more complex problems. For another example, Dr. Roggen takes us into his extraction process.
Dr. Roggen’s team, on the extraction side of the business, uses a HACCP plan not just for preventing contamination, but for protecting worker safety as well. “We are always thinking about making the best product, but I have to look out for my team,” says Dr. Roggen. “The health risk to staff in extraction processes is absolutely a hazard.” They use carbon dioxide to extract oil, which carries a good deal of risks as well. “So when we look at our critical control points we need to regularly maintain and clean the extractor and we schedule for that,” says Dr. Roggen.
Gloves, protective clothing, eyewear and respirators are required for workers in the extraction process.
“My team needs respirators, protective clothing, eyewear and gloves to prevent contamination of material, but also to protect the worker from solvents, machine oil and CO2 in the room.” That health risk means they try and stay under legal limits set by the government, which is a critical limit of 3,000 ppm of carbon dioxide in the environment. “We monitor the CO2 levels with our instruments and that is particularly important whenever the extractor is opened.” Other than when it is being opened, Dr. Roggen, notes, the extractor stays locked, which is an important worker safety protocol.
The obvious corrective action for them is to have workers leave the room whenever carbon dioxide levels exceed that critical limit. “We just wait until the levels are back to normal and then continue operation,” says Dr. Roggen. “We updated our ventilation system, but if it still happens they leave the room.” They utilize a sort of double check here- the buddy system. “I took these rules from the chemistry lab; we always have two operators working on the machine on the same time, never anyone working alone.” That buddy check also requires they check each other for protective gear. “Just like in rock climbing or mountain biking, it is important to make sure your partner is safe.” He says they don’t keep records for employees wearing protective gear, but they do have an incident report system. “If any sort of incident takes place, we look at what happened, how could we have prevented it and what we could change,” says Dr. Roggen.
He says they have been utilizing some of these principles for a while; it just wasn’t until recently that they started thinking in terms of the HACCP conceptual framework. While some of those steps in the process seem obvious, and it is very likely that many cannabis processors already utilize them in their standard operating procedures and quality controls, utilizing the HACCP scheme can help provide structure and additional safeguards in production.
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