Leaf Color Phenotype

Leaf color phenotype in cannabis refers to visible pigmentation variations in foliage, ranging from standard green to purple, red, or bronze hues. These colors result from anthocyanin and carotenoid expression, influenced by genetics, temperature stress, and light exposure during cultivation. While often associated with specific strain lineages—particularly those derived from Afghan or Indian landraces—leaf color is a morphological trait rather than a terpene itself. Breeders have documented color phenotypes across various genetic backgrounds, though the relationship between leaf pigmentation and cannabinoid or terpene profiles remains largely anecdotal. Understanding leaf color inheritance helps cultivators identify stable plant lines and supports selective breeding for consistent phenotypic expression.

Plant breeders use leaf color as a visual marker for phytochemical stability and environmental resilience. Selecting for consistent purple, red, or bronze phenotypes can indicate stable anthocyanin pathways, which some breeding programs correlate with specific terpene or cannabinoid profiles, though direct biochemical links remain under investigation.