Anthocyanin Phenotypes

Anthocyanin phenotypes describe cannabis plants that express purple, blue, or red pigmentation in flowers, leaves, and stems due to anthocyanin compounds accumulating under specific genetic and environmental conditions. These water-soluble pigments are distinct from chlorophyll and commonly appear when plants experience cooler temperatures or UV exposure during flowering. Anthocyanin expression is polygenically controlled, meaning multiple genes contribute to the intensity and hue of coloration. Lineage records frequently report anthocyanin phenotypes in cultivars descended from Purple Haze, Granddaddy Purple, and various Kush and Afghani crosses. The trait is largely cosmetic and unrelated to cannabinoid or terpene profiles, though breeders often select for stable expression as a market differentiator. Environmental factors—temperature fluctuations, light spectrum, and nutrient availabi

Breeders working with anthocyanin traits typically outcross stable purple-expressing lines to maintain genetic diversity while preserving pigmentation consistency across generations. Stabilizing anthocyanin phenotypes requires multi-generational selection and careful environmental documentation, as expression can be masked by warm growing conditions even in genetically predisposed plants.