Bract Morphology

Bract morphology refers to the physical structure, size, and arrangement of bracts—the specialized leaves surrounding cannabis flower clusters. Bract characteristics vary significantly across genetic lines, influencing visual phenotype, calyx-to-leaf ratio, and harvest processing requirements. Breeders working in this category track traits such as bract density, trichome coverage on bracts, and leaf-tip coloration as heritable markers. Understanding bract morphology is essential for cultivar identification, breeding selection, and post-harvest efficiency. Different bract phenotypes are commonly associated with distinct geographic origins and breeding lineages, making this trait valuable for genetic tracking.

Breeders selectively work with bract morphology to develop cultivars suited to specific growing environments, harvest methods, and market preferences. Tight bract structure and favorable calyx ratios are actively selected traits in many modern breeding programs, as they directly impact trim work, visual appeal, and genetic stability across generations.