Temperature Sensitive Coloring

Temperature-sensitive coloring refers to anthocyanin and carotenoid pigmentation in cannabis that shifts in response to growing conditions, particularly cooler temperatures during late flower. Plants expressing this trait commonly display purple, red, blue, or orange hues that intensify as night temperatures drop below 50–60°F. This phenotypic expression is genetically heritable but environmentally modulated, meaning the same cultivar may show different coloration under warm versus cool conditions. Lineage records frequently report temperature-sensitive coloring in strains with Indica-dominant or Afghan heritage, though the trait appears across diverse genetic backgrounds. Breeders studying this family recognize it as a complex polygenic expression influenced by both nuclear and potentially chloroplastic genetics.

Breeders working in this category select for stable anthocyanin and carotenoid production to create cultivars where color expression is predictable and visually consistent. Understanding environmental triggers helps breeders differentiate genetically fixed pigmentation from phenotypic noise, enabling more reliable cultivar stabilization and consumer communication.