Heritability

Heritability in cannabis breeding refers to the proportion of observed variation in a trait that is passed from parents to offspring through genetic mechanisms, rather than influenced by environmental factors. Understanding heritability helps breeders predict which characteristics—such as terpene profiles, plant morphology, or cannabinoid ratios—will reliably reproduce across generations. Traits with high heritability are more stable when selecting parent plants, while low-heritability traits may shift unpredictably depending on growing conditions, nutrition, and photoperiod. Breeders working in cannabis genetics use heritability estimates to prioritize which phenotypes merit repeated selection cycles and which require more consistent environmental controls to maintain expression.

Breeders use heritability data to design efficient selection programs, focusing intensive work on highly heritable traits that will breed true and avoiding wasted effort on environmentally sensitive characteristics. Documenting heritability of specific terpene or cannabinoid profiles across multiple generations helps establish which genetics are stable enough for commercial seed lines.