Hemp trichomes
Trichomes are the microscopic glandular hairs of the hemp plant. They produce and store cannabinoids, terpenes and flavonoids — the entire biochemical wealth.
Hemp trichomes
Trichomes are microscopic epidermal appendages — small glandular hairs — that cover the leaves, stems and especially the female flowers of the hemp plant (Cannabis sativa L.). They are the biosynthesis factories of cannabinoids (CBD, THC, CBG…), terpenes (myrcene, limonene…) and flavonoids.
Visible to the naked eye on a mature flower (the famous 'sugary' or 'frosted' appearance), they are studied in detail under microscope to assess the maturity of a lot.
The three trichome morphologies
1. Bulbous trichomes
- Size: 10-30 micrometers
- Location: throughout the plant surface
- Role: limited cannabinoid production
2. Capitate sessile trichomes
- Size: 25-100 micrometers
- Location: leaves and bracts
- Role: intermediate cannabinoid production
3. Capitate-stalked trichomes
- Size: 150-500 micrometers (visible to the naked eye)
- Location: mainly on the bracts of female flowers
- Role: majority of cannabinoid and terpene production
The capitate-stalked trichomes are the target of artisanal harvest: their density and ripeness condition the quality of the final product.
Color evolution = harvest indicator
During maturation, the trichome head (the gland) goes through three colors that signal cannabinoid biochemical stage:
| Stage | Color | Composition | Effect type | |---|---|---|---| | Immature | translucent | mostly CBGA | unripe, low concentration | | Mature | milky | CBDA/THCA at peak | optimal concentration | | Overripe | amber | CBDA/THCA degrading toward CBN | softer effect |
Artisanal producers examine trichomes under loupe before harvesting — too early = wasted cannabinoid potential, too late = degradation.
Industrial role and extraction
Mechanical extraction targeting trichomes
The most ancestral extraction techniques aim to detach the trichomes from the plant matter without using chemical solvent:
- Ice water hash : trichomes detach by agitation in cold water, then are sieved
- Dry sift : sieving the dried plant matter at fine mesh
- Rosin : pressing flowers (or hash) between two heated plates
These methods preserve the integrity of the cannabinoid + terpene profile because trichomes are not denatured by a solvent.
Trichomes and traceability
On a Certificate of Analysis (CoA), the diversity of measured terpenes is a partial indicator of trichome quality. A rich terpene profile reflects:
- Mature trichomes intact
- A non-degrading drying / curing process
- Storage protected from light, heat and oxygen
A fresh, well-conserved French peasant hemp produces a more complete trichome profile than a hemp that has gone through several months of inappropriate storage.