Anthocyanin Phenotype

Anthocyanin phenotypes describe cannabis plants expressing visible purple, blue, or red coloration in leaves, bracts, and flowers due to anthocyanin pigment accumulation. This trait is genetically regulated by multiple loci and becomes most apparent under specific environmental conditions—particularly cooler temperatures during late flowering and vegetative stress. Anthocyanin expression does not indicate cannabinoid or terpene profile; pigmentation and potency are independent traits. Lineage records frequently report anthocyanin dominance in strains descended from Afghan, Hindu Kush, and certain Californian heritage lines. The phenotype has become a visible breeding marker in modern cultivars, though expression varies significantly across clones and environmental contexts.

Breeders working in ornamental and connoisseur markets often select for stable anthocyanin expression to create visually distinctive cultivars. However, anthocyanin-producing plants are not inherently superior in cannabinoid content or aroma; breeders must maintain separate selection criteria for chemistry and appearance.