Pigmentation Expression

Pigmentation expression refers to the visible coloration of cannabis plant tissues—leaves, bracts, and flowers—determined by anthocyanins, carotenoids, and chlorophyll ratios. Environmental factors like temperature, light spectrum, and nutrient availability significantly influence whether latent pigment genes become phenotypically visible. Strains carrying anthocyanin-producing genetics often display purples, reds, or blues under cooler conditions or specific lighting, while others remain green across varied environments. Pigmentation is a heritable trait frequently observed in modern breeding programs, though expression varies widely even within the same genetic line. Documentation of pigmentation patterns helps breeders track genotype-to-phenotype relationships and select for desired visual characteristics across generations.

Breeders working with pigmentation traits use visual markers as a secondary selection criterion alongside cannabinoid and terpene profiles. Stable pigmentation expression across multiple generations indicates strong genetic fixation and is valuable for cultivar consistency and market differentiation.