What is Kief? Kief is the resin glands of Cannabis. The resin glands are where the terpenes and some cannabinoids live. By using a three part grinder you can harvest the dried trichomes for later use. Kief can be used in many ways. You can sprinkle it into bowl or joint, or add it when making homemade cannabutter or oil. You can press it into hash or filter it and press it into rosin. If you're looking for strains that produce a lot of kief try Gelato, White Widow or Purple Punch to name a few.