Kief
The loose powder of resin glands that falls off cannabis flower, made up mostly of broken trichome heads.
Kief is just the dusty resin that shakes loose from dried cannabis flower. It's more potent than the bud it came from because it's concentrated trichome heads, but it's not a 'pure' concentrate — unsifted kief is still cut with plant fragments, and potency varies wildly depending on screen size and source material. The 'pollen' nickname is a misnomer; kief has nothing to do with cannabis pollen.
Definition
Kief is the collected resin powder that separates from dried cannabis flower when it is agitated over a fine mesh screen. It consists primarily of broken trichome heads — the mushroom-shaped glandular structures that produce most of the plant's cannabinoids and terpenes [1] Strong evidence. The word comes from the Arabic kayf (كيف), historically used in North Africa to describe both the resin powder and the state of relaxed well-being it produces [2].
What's in it
Because trichome glands are where cannabinoid and terpene biosynthesis occurs, kief concentrates THCA (which converts to THC when heated), CBDA, and a range of terpenes [1][3] Strong evidence. Purity depends on screen size: finer screens (around 70–120 microns) filter out more plant matter and yield higher-potency, lighter-colored kief, while coarser screens let through stalks, leaf fragments, and contaminants [4] Strong evidence. Lab-tested commercial kief commonly ranges from 20% to 60% THC, but home-collected grinder kief is usually on the lower end.
What it does (and doesn't do)
Does: Kief is more potent by weight than the flower it came from, so a small sprinkle on a bowl or in a joint noticeably increases the dose Strong evidence. Pressed and heated, it becomes traditional hashish [3] Strong evidence.
Doesn't: Kief is not a solventless 'full-spectrum' concentrate in the same sense as Rosin or Ice Water Hash — it's dry-sifted and includes more plant contaminants. It also isn't inherently 'cleaner' than other concentrates; quality is determined by source material and sifting technique, not the method's name. And despite the slang term 'pollen,' kief has no relationship to actual cannabis pollen, which is reproductive material from male plants.
How it's used
Most consumers encounter kief as the powder that collects in the bottom chamber of a three-piece grinder. It's typically sprinkled on top of flower in a bowl or joint, pressed into discs of Hashish, or used to coat 'moon rock'–style pre-rolls. Heating is required to decarboxylate THCA into active THC [1] Strong evidence.
Sources
- Peer-reviewed Livingston, S. J., et al. (2020). Cannabis glandular trichomes alter morphology and metabolite content during flower maturation. The Plant Journal, 101(1), 37–56.
- Book Clarke, R. C. (1998). Hashish! Red Eye Press, Los Angeles. ↗
- Peer-reviewed Andre, C. M., Hausman, J. F., & Guerriero, G. (2016). Cannabis sativa: The Plant of the Thousand and One Molecules. Frontiers in Plant Science, 7, 19.
- Book Rosenthal, E. (2013). Beyond Buds: Marijuana Extracts—Hash, Vaping, Dabbing, Edibles and Medicines. Quick American Publishing. ↗
How this page was made
Generation history
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