Purple Phenotype

The purple phenotype describes cannabis plants displaying anthocyanin pigmentation, resulting in purple, violet, or burgundy coloration in flowers, leaves, or stems. This trait emerges from a combination of genetic predisposition and environmental factors, particularly cooler temperatures during flowering. Purple coloration does not indicate cannabinoid or terpene profile; it is purely a visual expression influenced by anthocyanin accumulation. Breeders have selectively worked with purple-expressing genetics across many lineages, making it a documented but aesthetically-driven classification rather than a chemotype indicator. Environmental stress, including temperature drops and light exposure, can trigger or intensify purple expression in genetically predisposed plants.

Breeders isolating for consistent purple expression typically select parent plants demonstrating stable anthocyanin production and cross them for heritable color traits. Purple phenotype selection is primarily aesthetic and used in strain marketing rather than for agronomic or cannabinoid development purposes.