Temperature Color Response

Temperature Color Response refers to the phenotypic shift in plant pigmentation—particularly anthocyanins and carotenoids—triggered by exposure to lower temperatures during late flowering and curing phases. Cannabis cultivars express this trait variably; some develop deep purples, blues, reds, or blacks when night temperatures drop below 50-55°F, while others show minimal color change. This is distinct from genetic predisposition for pigmentation and depends heavily on environmental stress during specific growth windows. The trait has no impact on cannabinoid or terpene profiles, though breeders often track it as a visual marker of phenotype expression and environmental responsiveness. Documentation of temperature sensitivity helps seed banks and cultivators predict plant behavior across different growing regions.

Breeders working with photoperiod and autoflower lines often monitor temperature response as a secondary phenotype marker to identify stable cultivar expressions and regional adaptability. Seed companies frequently report color-shift potential in strain descriptions to set grower expectations for outdoor or cool-climate cultivation.