Trichome Placement

Trichome placement refers to the spatial distribution of resinous glands across cannabis plant tissues—whether concentrated on flower calyxes, leaf surfaces, or dispersed throughout the plant. Breeders and researchers observe placement patterns as a heritable trait influenced by genetics and environmental conditions. Surface trichomes on outer calyxes typically contain higher terpene and cannabinoid concentrations than those on fan leaves. Placement affects both breeding selection and post-harvest processing efficiency. Understanding trichome distribution patterns helps breeders develop cultivars optimized for specific extraction methods or fresh-flower phenotypes. Documentation of placement patterns across lineages contributes to the broader cannabis genetics reference library.

Breeders selecting for extraction efficiency often prioritize dense calyx trichome coverage, while fresh-flower cultivar development may favor balanced placement that maximizes visual appeal and handling ease. Trichome placement inheritance is polygenic and responsive to cultivation variables, making it a useful selection marker across multiple breeding generations.