What Are Trichomes? Types, Sizes and How to Keep Them on Your Weed

Updated October 2026

Short answer: trichomes are the tiny, sticky, crystal-looking glands that cover cannabis flowers. They produce and store most of the plant's cannabinoids (like THC and CBD) and terpenes, the compounds behind aroma and flavor. There are three main glandular types, and when they shake loose in a 4 piece grinder, they collect as kief.

Look at a good bud under a light and it sparkles like it rolled through a snow globe. That frost isn't decoration, buddy. It's basically the whole point of the plant. Every flavor note, every smell that fills the room when you crack the jar, and most of the cannabinoids live in those little glands. Which means how you handle, store and grind your flower decides how many of them make it to your session.

What trichomes are (and why the plant makes them)

"Trichome" comes from the Greek word for hair, and plenty of plants have them. Tomato leaves, mint, nettles. On cannabis, the glandular ones are little resin factories: a stalk (or no stalk) topped with a head full of sticky oil.

The plant didn't grow them for us. Trichomes are defense. The sticky resin traps and deters insects, the strong smell discourages animals that might snack on the flowers, and the coating helps shield the plant from UV light and drying out. We just happen to like what's inside.

The three types of cannabis trichomes

Sizes via Technology Networks; sources vary a bit by cultivar and measuring method.

Those capitate-stalked trichomes are the stars. A 2020 study out of the University of British Columbia found that stalked trichomes have 12 to 16 secretory cells versus about 8 in sessile ones, produce more cannabinoids, and carry a strongly monoterpene-heavy terpene profile. The researchers also suggested sessile trichomes may be an earlier stage that grows into the stalked kind. So when your flower looks frosty, you're mostly looking at the good stuff.

There are also non-glandular trichomes, the little hairs that don't produce resin. They're why some leaves feel fuzzy. Nobody's collecting those.

Clear, cloudy, amber: what trichome color tells you

Growers watch trichome heads under a loupe or pocket microscope to time harvest. The heads change color as the plant matures:

• Clear: still developing. Harvest now and you're leaving a lot on the table.
• Cloudy or milky: generally considered peak cannabinoid production.
• Amber: THC begins breaking down into CBN. Many growers wait for a portion of amber heads, and people often describe later-harvested flower as heavier and more sedate.

Growing your own where it's legal? Our home grow guide covers harvest, drying and curing, which is where a lot of trichomes get saved or wrecked. Home grow rules vary a lot by state, so check your current state and local law first.

What destroys trichomes

Trichome heads are fragile little balloons on stems. Five things wreck them:

1. Handling. Every time you squeeze a bud, heads break off onto your fingers. That sticky smell on your hands is trichome resin that won't make it into your bowl.
2. Heat. Terpenes are volatile and evaporate. A hot car or a sunny windowsill cooks the aroma right out of a jar.
3. Light. UV degrades cannabinoids over time. Clear jars on a shelf are pretty and bad.
4. Air. Oxygen slowly degrades both terpenes and THC. Big half-empty jars mean more air per bud.
5. Bad grinding. Blunt pegs mash buds and smear resin onto the teeth, and spinning a grinder 40 times beats loose trichomes into dust that sticks everywhere.

Storage that works: an airtight glass jar sized to your stash, somewhere cool and dark, with a humidity pack if you like (most people aim for roughly 58 to 62 percent). Don't stash flower in the freezer for daily use: cold makes trichome heads brittle, and they snap off the moment you handle the bud.

How grinding affects trichomes

This is where we get opinionated, because it's literally our job. A grinder can either keep trichomes on your flower and catch the ones that fall, or it can smear them all over its own teeth.

• Cut, don't crush. Phoenician grinders use fewer, diametrically cut, razor-sharp teeth that slice flower like scissors. Less mashing, less resin smeared on metal. The full explanation is in the science of grinding.
• Get it out of the teeth fast. Oversized trapezoidal drop-through holes let cut flower fall through instead of tumbling around.
• Catch what falls. A 4 piece grinder's stainless screen lets loose trichomes sift into the bottom chamber as kief. A beveled bottom chamber and kief spoon make it easy to scoop.

Kief, screens and microns

Here's the twist most kief guides miss: trichome heads are smaller than the holes in any normal grinder screen. Even a fine 180 micron screen passes them. So screen size doesn't decide whether trichomes get through. It decides how much plant matter sneaks along with them, and how fast sticky resin clogs the mesh.

Phoenician screens are removable (one center screw), so you can swap sizes with the seasons. The Upgrade Kit includes all three, and the whole system is explained in our grinder screen micron guide.

Upgrade Kit — $19.99 to $22.99
Fine, standard and coarse screens so you can tune your kief to your flower, plus the tools to swap them.
See it →

Trichomes beyond the grinder: hash, rosin and lab tests

Basically every concentrate is just a different way of separating trichomes from plant matter:

• Dry sift: shaking flower over stacked screens. Your grinder's kief chamber is a tiny, very casual version of this.
• Ice water hash: agitating cold flower in ice water so brittle heads snap off, then catching them in fine micron bags.
• Rosin: heat and pressure squeeze the resin out of flower, kief or hash.
• Solvent extracts: made with butane, CO2 or ethanol in licensed labs. Do not try solvent extraction at home; it's dangerous and generally illegal outside a licensed facility.

And when a dispensary label lists THC percentage and terpenes, that lab test is mostly measuring what the trichomes produced. Frost is a decent visual hint of quality, though not a guarantee.

FAQ

Are trichomes the same as kief?

Kief is trichomes that have fallen off the flower and been collected, usually in a grinder's bottom chamber or by dry sifting.

Can you see trichomes with the naked eye?

You can see the frosty coating, which is mostly capitate-stalked trichomes. To see individual heads and their color, use a jeweler's loupe or a pocket microscope.

Do grinders destroy trichomes?

Blunt grinders smear some onto their teeth. Sharp cutting teeth keep most on the flower, and a 4 piece screen collects the loose ones as kief instead of losing them.

What micron screen is best for collecting trichomes?

All standard grinder screens let trichome heads through. Pick fine (180) for purity, standard (300) for balance, coarse (400) for sticky flower or the most kief.

Your flower spent months building those trichomes. Spend thirty seconds making sure your grinder doesn't waste them.

Keep reading

• Cannabis terpenes and how grinding affects them
• How to clean a weed grinder
• The best weed strains of 2026 and how to grind them