Also known as “dry sift,” kief is the accumulation of detached trichomes that fall off the cannabis flower. This potent, powdery substance collects in the bottom chamber of a 4-piece grinder. Because it’s a concentration of the cannabinoid and terpene-producing glands, kief is significantly more potent than the flower it came from and can be sprinkled on a bowl or in a joint to increase its potency.