Trichomes

Trichomes are not technically terpenes, but rather the resinous glandular structures on cannabis flowers where cannabinoids and terpenes are synthesized and stored. These microscopic, hair-like appendages appear across the plant's surface and are classified by type: capitate-stalked (largest, visible to the naked eye), capitate-sessile (smaller, abundant), and bulbous (smallest). Trichome density and maturation stage—tracked by color changes from clear to milky to amber—are primary selection criteria in breeding programs and cultivation documentation. Understanding trichome development is essential for breeders working to stabilize cannabinoid and terpene expression across generations.

Breeders selectively propagate lines exhibiting high trichome production and consistent maturation timing, as these traits correlate with secondary metabolite accumulation. Trichome morphology and density are heritable characteristics used to differentiate cultivars and track genetic stability in seed and clone lines.