Bract Morphology

Bract morphology refers to the physical structure and appearance of bracts—the modified leaves that surround cannabis flower clusters. Rather than a terpene, this term describes a visual botanical trait affecting resin gland density, trichome distribution, and overall cannabinoid concentration on the flower surface. Bract size, texture, and leaf-to-calyx ratio vary significantly across cultivars and influence harvest efficiency and final product appearance. Breeders working in this category often select for tight, resinous bracts associated with higher trichome coverage, while others prioritize ease of trimming or processing. Understanding bract morphology helps cultivators and breeders assess flower quality, predict yields, and optimize cultivation practices for specific end uses.

Breeders select for bract traits to improve trichome density, cannabinoid concentration, and processing efficiency. Tight, densely-packed bracts are often favored in hash and concentrate production, while broader bracts may facilitate machine trimming in large-scale operations.