The Greatest Way to Remediate Moldy Cannabis is No Remediation at All


Shoppers are largely unaware that most industrial cannabis grown now undergoes some type of decontamination to treat the industry’s increasing trouble of mold, yeast and other microbial pathogens. As additional cannabis brands fail regulatory testing for contaminants, organizations are increasingly turning to radiation, ozone gas, hydrogen peroxide or other damaging remediation techniques to make certain compliance and stay away from solution recalls. It has produced cannabis cultivation and extraction additional difficult and additional pricey than ever, not to mention inflaming the industry’s ongoing provide trouble.

The trouble is only going to get worse as states like Nevada and California are starting to implement additional regulations like even tougher microbial contamination limits. The technological and financial burdens are becoming as well a great deal for some cultivators, driving some of them out of company. It is also placing an even higher strain on them to meet solution demand.

It is important that the sector establishes new solution requirements to reassure shoppers that the cannabis merchandise they obtain are protected. But it is even additional important that the sector appear beyond conventional agricultural remediation techniques to resolve the microbial challenges.

Compounding Dangers

Mold and other microbial pathogens are discovered everywhere in the atmosphere, like the air, meals and water that persons consume. Whilst there is no consensus but on the well being consequences of consuming these contaminants by way of cannabis, dangers are definitely emerging. According to a 2015 study by the Cannabis Security Institutei, molds are normally harmless in the atmosphere, but some may well present a well being threat when inhaled, especially to immunocompromised folks. Mycotoxins resulting from molds such as Aspergillus can bring about illnesses such as allergic bronchopulmonary aspergillosis. Even when killed with remedy, the dead pathogens could trigger allergies or asthma.

Photo credit: Steep Hill- a petri dish of mold development from tested cannabis

There is an abundance of pathogens that can influence cannabis cultivation, but the most widespread kinds are Botrytis (bud rot, from time to time named gray mold) and Powdery Mildew. They are also amongst the most devastating blights to cannabis crops. Quite a few chemical controls are offered to enable protect against or stem an outbreak, ranging from fungicides and horticultural oils to bicarbonates and biological controls. Whilst these controls may well save an otherwise doomed crop, they introduce their personal possible well being dangers by way of the overexposure and consumption of chemical residues.

The situation is additional compounded by the truth that the states in which cannabis is legal can not agree on which microbial pathogens to test for, nor how to test. Colorado, for instance, demands only 3 pathogen tests (for salmonella, E. coli, and mycotoxins from mold), when Massachusetts has exceedingly strict testing regulations for clean merchandise. Massachusetts-primarily based testing lab, ProVerde Laboratories, reports that about 30% of the cannabis flowers it tests have some type of mold or yeast contamination.

If a cannabis solution fails necessary microbial testing and can not be remedied in a compliant way, the grower will inevitably knowledge a serious – and potentially crippling – monetary hit to a lost crop. Willow Industries, a microbial remediation firm, says that cannabis microbial contamination is projected to be a $three billion trouble by 2020ii.

Remediation Falls Brief
With the monetary stakes so higher, the cannabis sector has taken cues from the meals sector and adopted a assortment of methods to remediate cannabis harvests contaminated with pathogens. Ketch DeGabrielle of Qloris Consulting spent two years studying cannabis microbial remediation techniques and summarized their pros and consiii.

He discovered that some widespread sterilization approaches like autoclaves, steam and dry heat are impractical for cannabis due the decarboxylation and harsh harm they inflict on the solution. Some growers spray or immerse cannabis flowers in hydrogen peroxide, but the resulting moisture can in fact bring about additional spores to germinate, when the chemical reduces the terpene content material in the flowers.

Powdery mildew begins with white/grey spots observed on the upper leaves surface

The additional favored, technologically sophisticated remediation approaches incorporate ozone or comparable gas remedy, which is comparatively affordable and treats the whole plant. Nevertheless, it is complicated to gas merchandise on a huge scale, and gas benefits in terpene loss. Microwaves can kill pathogens proficiently by way of cellular rupture, but can burn the solution. Ionizing radiation kills microbial life by destroying their DNA, but the approach can build carcinogenic chemical compounds and damaging absolutely free radicals. Radio frequency (which DeGabrielle considers the ideal technique) proficiently kills yeast and mold by oscillating the water in them, but it can outcome in moisture and terpene loss.

The bottom line: no remediation technique is best. Prevention of microbial contamination is a superior strategy. But all 3 traditional approaches to cannabis cultivation – outdoors, greenhouses and indoor develop operations – make it exceptionally complicated to handle contamination. Mold spores can simply achieve a foothold each indoors and out by way of air, water, meals and human speak to, immediately spreading into an epidemic.

The sector requirements to establish new good quality requirements for solution purity and employ new increasing practices to meet them. Sophisticated technologies can enable build close to best increasing ecosystems and microclimates for increasing cannabis absolutely free of mold contamination. World-wide-web of Items sensors combined with AI-driven robotics and automation can significantly lessen human intervention in the increasing approach, along with human-induced contamination. Organic sunlight supplemented with new lighting technologies that give close to complete-light and UV spectrum can stimulate robust development additional resistant to illness. Computational fluid dynamic models can enable growers reach optimal temperature, humidity, velocity, filtration and sanitation of air flow. And tissue culture micropropagation of plant stock can do away with virus and pathogen threats, to name just a handful of of the newest innovations.

Expanding legal cannabis now is a risky company that can expense growers millions of dollars if pathogens contaminate a crop. Remediation techniques to get rid of microbial contamination may well perform to varying degrees, but they introduce a further set of challenges that can influence customer well being and comprise solution good quality.


i. Holmes M, Vyas JM, Steinbach W, McPartland J. 2015. Microbiological Security Testing of Cannabis. Cannabis Security Institute. material/uploads/2015/06/Microbiological-Security-Testing-of-Cannabis.pdf

ii. Jill Ellsworth, June 2019, Eliminating Microbials in Marijuana, Willow Industries,

iii. Ketch DeGabrielle, April 2018, Biggest U.S. Cannabis Farm Shares Two Years of Mold Remediation Study, Analytical Cannabis,



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