Carotenoid Pigmentation

Carotenoid pigmentation refers to the yellow, orange, and red hues that appear in cannabis flowers, leaves, and trim due to accumulation of carotenoid compounds. These lipid-soluble pigments—including beta-carotene, lycopene, and xanthophyll—are synthesized by the plant and often become more visible as chlorophyll breaks down during flowering and senescence. Carotenoid expression is influenced by genetics, light exposure, temperature fluctuations, and nutrient availability, particularly phosphorus and potassium during late flowering. While carotenoids are commonly associated with autumn-like visual phenotypes in cannabis, their appearance does not indicate cannabinoid or terpene profile. Breeders and cultivators monitor carotenoid development as a secondary marker of plant maturity and phenotype stability, though expression varies significantly between genetically identical plants grown

Breeders working with photoperiod and autoflowering lines often select for consistent carotenoid pigmentation as a visual marker of desired phenotype expression and genetic stability. Carotenoid intensity can be strengthened through selective breeding and environmental manipulation, making it a useful trait for establishing recognizable cultivar profiles across multiple crop cycles.