What is kief? It's the fine, sandy dust that collects in the bottom chamber of a grinder: loose trichome heads that have broken off the flower. Those tiny glands are where cannabis makes its cannabinoids and terpenes, so kief carries more punch per pinch than flower. Here's what kief is, how to collect and store it, and simple ways to use it.
What is kief? Loose trichome heads
Look closely at a cannabis flower and you'll see a coating of tiny, mushroom-shaped glands called trichomes. The stalked glandular trichomes on female flowers produce resin that holds cannabinoids such as THCA and CBDA, along with terpenes and other compounds. When flower is ground or rubbed over a screen, the heads of those glands break off and fall through. That loose powder is kief.
The word comes from the Arabic kayf, meaning pleasure, and English borrowed it in the early 1800s. For more on the glands themselves, see our guide to cannabis trichomes.
What it's made of, and judging color and purity
Good kief is mostly trichome heads, with a little fine plant matter mixed in. Color is a handy clue. As a rough guide, pale blond to light tan kief is cleaner, while a green tint means more leaf and plant material came along for the ride.
Texture and smell help too. Fresh kief is fine and slightly sticky, and it smells like the bud it was sifted from. Kief that's dark, dusty or flat-smelling has likely been sitting too long.
Kief potency compared with flower
Kief is more concentrated than the flower it fell from, because it's mostly the part of the plant where cannabinoids are made, minus much of the leaf and stem. How much stronger depends on the flower and on how clean the kief is, so there's no single number. Packaged kief from a licensed store lists its THC and CBD on the label. If it came from your grinder, assume it's noticeably stronger than the flower and use less.
That matters most for newer consumers. A pinch sprinkled on a bowl can turn a mild session into a strong one.
How to collect kief: three-chamber grinders and sifting screens
The easiest way to collect kief is a grinder with three chambers:
- The top chamber has the teeth that grind your flower.
- Ground flower drops into the middle chamber, which has a fine mesh screen at the bottom.
- Trichome heads sift through the screen into the bottom chamber, the kief catcher.
Every so often, open the bottom chamber and gently gather the kief with the small scraper many grinders come with. Go easy on the screen, since hard scraping can tear the mesh.
You can also dry-sift by hand: rub dried flower gently over a fine screen and let the kief fall onto a clean surface below. Some people chill their grinder or flower for a few minutes first, since cold makes trichomes more brittle. Our guide to cannabis accessories covers grinders and other gear, and accessories vary by store, so ask our budtenders what's available.
Buying and storing kief
Some stores sell kief on its own or pressed, and every package carries a label with its THC and CBD content. Selection varies, so check your store's menu before you visit.
To keep kief fresh:
- Store it in a small airtight glass jar, filled close to the top to limit air.
- Keep it somewhere cool and dark, away from heat and sunlight.
- Keep packaged kief in its original container, locked away from children and pets.
Over time, air degrades kief. THC slowly reacts with oxygen and turns into CBN, so old kief tends to feel weaker and different.
How to use kief: topping, on its own, infusions, pressed hash and pucks
- Top a bowl or joint: sprinkle a small pinch over packed flower or along the inside of a joint before rolling.
- On its own: some dry-herb vaporizers can handle fine material; check your device's instructions.
- Infusions: activate kief with gentle heat first, then infuse it into butter or oil. Our cannabutter guide walks through the process.
- Pressed hash: compress kief into a solid piece you can break off as needed (see below).
- Pucks: a pollen press turns kief into a small coin-shaped puck that's easy to store.
Kief also shows up in some pre-rolls, which can be coated or filled with it. Our guide to infused pre-rolls explains how they differ from regular joints. Whatever you choose, go smaller than you'd expect.
How to press kief into hash
Pressing keeps kief from scattering and makes it easier to store:
- With a pollen press: fill the chamber with kief, screw the press down as tight as it goes and leave it for a few minutes. Out comes a firm puck.
- By hand: fold the kief into a piece of parchment paper, warm the packet gently in your hands, then press and roll it firmly until it holds together.
Skip high heat, which can scorch kief and drive off its aroma. And never try solvent extraction at home: butane and other solvents can ignite, and that work belongs in licensed labs. Our guide to hash oil explains how solvent extracts differ from pressed hash.
CBD kief from hemp
Hemp flower has trichomes too, so CBD kief collects the same way. Because kief concentrates whatever the trichomes hold, including any THC, kief from hemp can carry more THC per gram than the hemp flower it came from. Michigan defines hemp as cannabis with no more than 0.3% total THC, counting THCA, so check the lab results before assuming hemp kief stays under that line.
Kief and Michigan law
Michigan lets adults 21 and older carry up to 2.5 ounces of cannabis, with no more than 15 grams of that as concentrate. At home the cap is 10 ounces, and anything beyond 2.5 ounces must be kept locked up. For how specific products are classified, see our Michigan cannabis law guide or ask at the counter. Store kief where children and pets can't reach it, and keep it in Michigan. Kief is for adults 21 and older; please enjoy it responsibly.
