Anthocyanin Expression

Anthocyanin expression refers to the visual pigmentation traits in cannabis plants, where water-soluble flavonoid compounds produce purple, blue, red, or black coloration in flowers, leaves, and stems. These pigments are triggered by genetic predisposition combined with environmental factors—particularly cooler night temperatures during flowering. Anthocyanin production is not directly linked to cannabinoid or terpene profiles, though certain lineages have been selected for visible pigmentation over multiple generations. Breeders document anthocyanin expression as a phenotypic marker, useful for plant identification and strain differentiation in breeding programs. The trait is governed by multiple genes and environmental conditions, making it a reliable secondary selection tool alongside other morphological characteristics.

Breeders working with anthocyanin-rich lineages use pigmentation as a consistent visual identifier for tracking genetic lines and crossing projects. Stable anthocyanin expression across generations can indicate strong genetic fixation of underlying traits, making it a useful secondary marker in structured breeding programs.