Pigmentation Anthocyanins

Anthocyanins are water-soluble pigments responsible for purple, red, and blue coloration in cannabis foliage and flower tissue. These compounds are distinct from chlorophyll and carotenoids, and their expression is influenced by genetics, temperature, and light exposure during cultivation. Anthocyanin-rich strains often carry recessive alleles associated with cold-hardy or high-altitude landraces. While pigmentation itself is a visual trait with no direct effect on cannabinoid or terpene profiles, breeders have long selected for anthocyanin expression as a marker of genetic diversity and regional adaptation. Documentation of anthocyanin-dominant phenotypes remains valuable for strain genealogy and conservation records.

Breeders working with anthocyanin-dominant lines often use pigmentation as a phenotypic tracker in multi-generational selection programs. Stabilizing purple or blue morphology typically requires selective breeding across F2–F4 generations to establish consistent expression within a given genetic background.