On Judging Cannabis Buds

On Judging Cannabis, Then and Now

Health Canada has no established grading standards for dried cannabis,

leaving the standard-setting responsibility to LPs


AUTHOR: Judith Stamps


Evaluating excellence in cannabis flowers was once the province of either  unlicensed growers or dispensary owners. In the new legal market, this task is being shifted largely to licensed producers (LPs), a shift that, interestingly, has brought few changes to the field.  Dana Larsen, who has owned The Medical Dispensary in Vancouver since 2008, employs premier cannabis testers. One is Carol Gwilt, co-owner of Weed, Glass & Gifts dispensary, who has been testing cannabis for 15 years. Gwilt begins this task “by interviewing growers on their methods.”

Checks a staged process

“All cannabis on offer,” Larsen notes, “is then assessed in three stages.”  A first, “pass/fail test, examines buds under a microscope at 60 to 100 times enlargement.”  Ideally, one sees densely packed bracts (modified leaves) studded with trichomes, the tiny, mushroom-shaped, translucent structures that contain the plant’s cannabinoids.  These should be intact, and creamy-white to yellow in colour, indicating maturity.  Buds should be neatly trimmed, and free of insects and moulds, with deep bract colours.  The second and third stages involve smoking samples. Stage two “tests for cheminess” (chemical taste), indicating the presence of fertilizers and other additives.  Good growing practices require all nutrients to be “flushed out of the plant before harvest.”  At this point, states Larsen, “buds are lab-tested for pesticides, and CBD/THCprofiles. The final stage assesses fragrance, which should be pleasant; and checks the strength and style of the effect.”  Larsen and Gwilt routinely reject 80 percent of the cannabis they test.

Enter the government

With legalization of cannabis for adult use, Health Canada has come to play a role, though an intentionally limited one. Health Canada “requires that all be tested for microbial and chemical contamination, but it has not established grading standards for dried cannabis, reports Tammy Jarbeau, senior media relations advisor for the federal department.  Health Canada’s position places the burden of setting standards entirely onto LPs.  Derek Pedro, master grower and design, cultivation and production partner at WeedMD, appears to have welcomed the challenge.  A former licensed medical grower with 14 facilities, Pedro has bred “54 cannabis varieties,” and says he knows them “as well as I know my own kids.”

On quality, he shares much with Larsen. Pedro is careful to flush all plants prior to harvest, and expects all buds to “diamond out” (sparkle with trichomes, when viewed under magnification). “Taste and smell,” he adds, “should be enticing.” All buds are then sent out for third-party lab testing, as per federal requirements.  To fine-tune his assessment, Pedro uses a focus group, which currently consists of 12 clients.  He grows small, select batches of plants, offering “samples of these at reduced cost, to medical clients.” They provide feedback, and that determines what he grows in quantity.  Lisa Campbell, CEO of Lifford Cannabis Solutions, which markets LP cannabis, agrees with these criteria, emphasizing the need for testers to try products first-hand.

One key difference between Larsen and Pedro, however, is their respective views on curing cannabis. Curing entails hanging cannabis branches upside down for a set time, in a controlled environment. Pedro cures his buds for a week; Larsen and Gwilt favour three to four. “The extra time,” explains Gwilt, “breaks down the starches and sugars that moulds and yeasts feed on, and mellows the resin, producing a milder, smoother smoke.”  Books on cultivating cannabis by renowned experts, Jorge Cervantes and Daniel Boughen , side with Gwilt. Will the emerging legal market develop a category for long-cured cannabis?

Medical and recreational: different or the same?

Pedro’s choice of testers raises a more general question, however. Is there a difference between medical and recreational cannabis? Maybe not.  Jarbeau says Health Canada recognizes “no difference between medical and non-medical cannabis products in the way they are cultivated, processed or packaged.”  Gwilt, for her part, sees “all use as medicinal;” while Larsen rejects the term, “recreational,” maintaining that it trivializes the plant. Pedro calls cannabis “preventive medicine,” and Campbell says she believes the key always is good


While sources share more views than not on quality assessment, their hopes for the future are likely to inspire more lively debate. Larsen wants to see a wider range of substances legalized, Gwilt would like to see greater stability in the

cannabis menus on offer, Pedro’s wish is for more randomized controlled trials, and Campbell would like a special category established for organic growers.

Judith Stamps.  Published by TheGrowthOp, January 18, 2019.

Judith Stamps

Judith Stamps holds a doctorate in political theory from the University of Toronto, and has taught political science at the University of Victoria. She is author of Unthinking Modernity: Innis, McLuhan and the Frankfurt School, as well as numerous journal articles and letters to the editor. From 2013-2018, she served as editor of Cannabis Digest, and wrote weekly blogs for Cannabis Digest Blogs. Her current writing focuses on cannabis history, science, and culture, and the concept of prohibition. She is a guest writer for The Daily Hive: Grow; Post Media's TheGrowthOp; and BotaniQ Magazine.

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