Testing Your Cannabis For Mould And Its Potency


The two things changing for most of us Canadians this year—being allowed to buy and grow our marijuana—are making it suddenly necessary to understand a thing or two about testing. Whether we buy it or grow it, cannabis can become contaminated to toxic levels, even legal cannabis. 

So, how do you, an ordinary citizen, get your weed checked for cannabinoid potency, pesticides, and toxic mould? We investigated your options. 

Mouldy homegrown products are prevalent and should be found out early before they are a) used, and b) the grower continues any practices that result in mould. 

The human nose is our first line of defence against toxic mould and has tens of thousands of years of ancestral rot and decay detection. Start there, if it smells “bad” funky either dump it or give it a second chance with some chemical testing. 




A commercial lab specializing in cannabis can help a personal gardener test their crops for a relatively small fee. The marijuana lab assessment consists of a potency test, which gives you the THC and CBD content as a percentage, plus a microbial scan. 

The microbe test is when the lab cultures a sample on an agar plate and seeing if lots of microbes grow. A lot of people have been posting these on social media with labs testing everything from the germs on hand dryers to the wildlife developing on the bottom of a New Yorker’s shoes. 

If the microbe count is over a specified limit, the sample fails. 

Turn around time is between 5-10 days—worth it if you don’t want to be smoking what’s growing in a Petri dish. 

April 29, 2018

by Davie Dabbs aka Popeye

Profile photo of Davie Dabbs aka Popeye
Davie is a long time cannabis professional who has worked not only as a cultivator but in all aspects of retail cannabis. From budtender, to wholesale and retail management, and from harvester to advanced hydroponic specialist, Davie has been around the block more than once. Now residing in beautiful British Columbia, Davie now works with acres of greenhouses, producing some of the best buds in the country.


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