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.
See CBD extraction methods.
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.
Related articles
- Hemp terpenes - The entourage effect - CBD extraction methods - Hemp glossary