Bract Calyx Ratio

Bract-to-calyx ratio describes the proportional size and coverage relationships between bracts (leaf-like structures) and the underlying calyx tissue in cannabis flower clusters. This morphological trait influences visual appearance, trichome density distribution, and structural integrity of the final flower. Breeders selecting for different ratios may prioritize either visual aesthetics, handling robustness, or specific terpene/cannabinoid expression patterns tied to tissue type. High bract-coverage phenotypes often present denser, more compact flowers, while lower ratios expose more calyx tissue. Understanding this ratio helps breeders predict offspring flower structure and develop stable cultivars within target morphology categories.

Breeders use bract-calyx ratio selection to stabilize flower phenotypes across generations and predict flowering structure consistency. This trait is often crossed deliberately to achieve desired visual profiles and structural characteristics in breeding lines.