Pigmentation Phenotype

Pigmentation phenotype refers to the visible color expression in cannabis plants, ranging from deep purples and blues to reds and blacks, determined by anthocyanin and other flavonoid compounds. This trait is largely genetic but responsive to environmental triggers, particularly cooler temperatures during flowering, which can intensify color development. Pigmentation is distinct from chlorophyll-based greens and appears most prominently in leaf tissue, bracts, and sometimes pistils. Breeders have long selected for stable pigmentation expression as a secondary marker, though color alone does not indicate cannabinoid or terpene content. Documentation of pigmentation phenotypes helps establish strain identity and breeding lineage in heirloom and modern cultivars.

Breeders working toward consistent visual markers often track pigmentation phenotypes as a reproducible trait across generations. Stable pigmentation selection can support strain stabilization and cultivar recognition, though it requires controlled environmental documentation to distinguish genetic from environmental color expression.