Pigment Expression

Pigment Expression refers to the visual manifestation of anthocyanins, carotenoids, and chlorophyll in cannabis plant tissues—determining leaf, bract, and flower coloration. Genetic factors, environmental conditions (temperature, light, pH), and maturation stage all influence whether pigments display as purples, reds, yellows, or oranges alongside the plant's base green coloring. Breeders have long tracked pigment traits as visual markers of genetic lineage, though pigmentation alone does not indicate cannabinoid or terpene content. Understanding pigment expression requires distinguishing between stable genetic traits and environmentally-induced color shifts that may not breed true. Documentation of pigment phenotypes helps maintain strain identity across generations and growing environments.

Breeders select for consistent pigment expression to stabilize strain aesthetics and support accurate phenotype identification in seed libraries. Pigment markers are often used alongside chemotype data to verify genetic stability and distinguish similar lineages.