Purple Phenotypes

Purple phenotypes refer to cannabis plants exhibiting anthocyanin pigmentation in leaves, bracts, or flowers—ranging from deep violet to burgundy hues. This coloration occurs when anthocyanin compounds accumulate in response to environmental stressors, particularly cooler temperatures during late flowering, though genetic predisposition varies significantly across lineages. Purple expression is not linked to cannabinoid or terpene profiles; it is a purely visual trait controlled by multiple genes interacting with growing conditions. Breeders have selectively worked with purple-expressing genetics for decades, establishing cultivar lines like Granddaddy Purple and Ube where anthocyanin production is relatively stable and heritable. Documentation of purple phenotypes appears across diverse strain families, including Indica-dominant, sativa-dominant, and hybrid backgrounds. Growers pursuing

Breeders select for purple phenotypes primarily as a visual marker and market differentiation tool. Stability of purple expression across generations is tracked through selective breeding, with some cultivars showing consistent anthocyanin production while others display it sporadically depending on phenotype and environmental conditions.