Cold Temperature Color

Cold Temperature Color refers to the anthocyanin and carotenoid pigmentation that emerges in cannabis plants when exposed to low temperatures, typically below 50°F (10°C) during late flowering or the final weeks before harvest. These water-soluble pigments create visual shifts from green to purple, blue, red, or burgundy hues—distinct from chlorophyll breakdown. The intensity and specific color depend on plant genetics, ambient temperature fluctuations, nutrient availability (particularly phosphorus), and light spectrum. This trait is commonly observed in indica-dominant and hybrid lineages with specific genetic markers for anthocyanin production, though phenotypic expression varies significantly across individual plants and growing conditions.

Breeders working in ornamental and specialty markets often select for cold-responsive color genetics to create visually distinctive cultivars. Stabilizing this trait requires identifying and crossing parents that reliably express pigmentation under temperature stress, while maintaining vigor and cannabinoid profiles.