Temperature Responsive Color

Temperature-responsive color phenotypes describe cannabis cultivars that express distinct pigmentation changes in response to environmental temperature fluctuations, particularly during the flowering stage. Plants exhibiting this trait commonly shift from green foliage to purple, blue, red, or burgundy hues when exposed to cooler night temperatures, a process driven by anthocyanin and other flavonoid accumulation in leaf and calyx tissues. This color expression is genetically heritable but remains environmentally conditional—the same cultivar may display minimal color change in warm climates while showing dramatic pigmentation in cooler regions. Lineage records frequently report this trait in strains carrying genetics from high-altitude or temperate-origin breeding stock. Understanding temperature responsiveness is relevant to both breeding programs seeking stable visual markers and cult

Breeders working with temperature-responsive genetics use this trait as a phenotypic marker for cultivar identification and stability testing across growing environments. Stabilizing color expression consistency across temperature ranges remains a central goal in selection programs focused on predictable visual characteristics.