Trait Heritability

Trait heritability in cannabis genetics refers to the proportion of observed variation in a trait (such as terpene expression or plant morphology) that is attributable to genetic differences rather than environmental factors. Understanding heritability helps breeders predict which characteristics will reliably pass to offspring and which depend heavily on growing conditions, nutrient availability, light exposure, and stress responses. High heritability traits are more stable across generations; low heritability traits show greater phenotypic plasticity. Terpene profiles in particular demonstrate mixed heritability—some monoterpenes show strong genetic control, while sesquiterpene ratios often fluctuate with cultivation variables. Breeders use heritability estimates to set realistic breeding goals and identify which traits warrant selection pressure versus environmental optimization.

Breeders prioritize selecting for high-heritability traits to ensure genetic stability in new lines. Understanding heritability also guides decisions about phenotype hunting—identifying whether observed variation stems from genetics (worth stabilizing) or environment (not worth pursuing in breeding).