Pigment Genetics

Pigment genetics in cannabis refers to the inherited traits controlling anthocyanin, carotenoid, and chlorophyll expression in plant tissues. These compounds produce the visible color variations—purples, reds, blues, and yellows—commonly observed in flowers and leaves across different cultivars. Pigment expression is polygenic, meaning multiple genes interact with environmental factors (temperature, light, pH) to determine final coloration. Breeders have long documented color variations in heirloom landraces and modern cultivars, though the specific genetic mechanisms remain an active area of horticultural study. Unlike terpenes, pigments do not directly contribute aroma but serve as visual markers of genetic diversity within breeding programs.

Breeders track pigment phenotypes as stable visual markers for cultivar identification and parentage verification. Color-based selection has been used informally in cannabis cultivation for generations, though reproducibility depends on environmental control and genetic stability of parent lines.