Bracts

Bracts are modified leaves surrounding cannabis flower clusters, technically distinct from terpenes but often discussed in cannabis genetics literature. These specialized leaf structures accumulate resinous trichomes densely, particularly in cultivars selected for cannabinoid and terpene production. Bract development and morphology vary significantly across strain families, influenced by photoperiod sensitivity, genetic background, and environmental stress responses. Breeders frequently examine bract-to-calyx ratios and trichome density on bracts as phenotypic markers during selection. Dense, resin-heavy bracts are commonly associated with cultivars bred for flower potency and volatile compound concentration. Understanding bract structure remains relevant to cultivation practices and breeding line assessment.

Cannabis breeders observe bract characteristics—size, density, and trichome coverage—as visual indicators of resin production potential and phenotypic stability. Bract morphology is often used in early-stage plant selection and is frequently documented in lineage records for indica, sativa, and hybrid breeding programs.