Dark Pigmentation Phenotype

Dark pigmentation in cannabis refers to the expression of anthocyanin and other pigment compounds that produce deep purple, black, or burgundy coloration in flowers, leaves, and sometimes stems. This phenotype is inherited through recessive and co-dominant genetic pathways, commonly appearing in cultivars descended from Afghani landraces, certain South Asian genetics, and modern breeding lines intentionally selected for visual distinction. The trait intensifies under cooler night temperatures and UV exposure during flowering, though genetic predisposition remains the primary determinant. Dark pigmentation is often aesthetic-focused in commercial breeding but serves no known functional advantage in cannabis horticulture or cannabinoid production.

Breeders working with dark phenotypes typically maintain parent selection records and environmental controls to stabilize color expression across generations. Crossing dark-pigmented lines with complementary cannabinoid or terpene profiles requires multi-generational stabilization to ensure consistent trait stacking without loss of vigor.