Trichome Glands

Trichome glands are specialized epidermal structures that develop across cannabis plant surfaces, primarily responsible for producing and storing cannabinoids, terpenes, and other secondary metabolites. These microscopic, hair-like or bulbous outgrowths appear most densely on flowers and upper leaves, with three main morphological types documented: bulbous (smallest), capitate-sessile (medium), and capitate-stalked (largest and most cannabinoid-rich). Trichome density and morphology vary significantly across genetic lineages, influenced by both heredity and cultivation conditions. Breeders have long observed correlations between visible trichome coverage and phytochemical profiles, making trichome architecture a key observable trait in selection work. Understanding trichome development helps contextualize cannabinoid and terpene expression across different strain families.

Plant breeders use trichome morphology as a visual marker during selection, as capitate-stalked trichome density often correlates with higher secondary metabolite production in target lineages. Detailed trichome phenotyping supports decisions about parent plant selection and helps stabilize desired chemical profiles across successive generations.