Purple Phenotype Family

The Purple Phenotype Family encompasses cannabis cultivars expressing anthocyanin pigmentation in leaves, calyxes, or bracts, typically visible during cooler night temperatures in late flowering. Purple coloration is a heritable trait influenced by both genetic predisposition and environmental factors—particularly temperature and light exposure. Notable lineages like Purple Urkle, Grandaddy Purple, and Purple Punch have established purple expression as a stable trait in their genetic backgrounds. Breeders working within this family often select parent plants demonstrating consistent anthocyanin production across generations. Documentation of purple phenotypes dates back several decades in cannabis breeding records, with multiple genetic pathways contributing to the trait across different strain lines.

Breeders use purple phenotypes as a visual marker for selective breeding programs, though purple expression alone does not indicate cannabinoid or terpene profiles. Stabilizing purple traits requires multi-generational selection and controlled environmental conditions to distinguish genetic factors from phenotypic plasticity caused by temperature stress.