Chlorophyll Phenotypes

Chlorophyll phenotypes describe observable variations in pigment expression across cannabis plants, ranging from standard green to purple, red, and rare blue hues. These color variations arise from environmental stress (cold exposure, UV light, nutrient shifts), genetic predisposition, and anthocyanin accumulation—water-soluble pigments distinct from chlorophyll itself. Breeders working in this category often select parent plants exhibiting stable color traits to establish predictable phenotype lines. Chlorophyll phenotypes are commonly associated with specific cultivar families and regional breeding programs, though the underlying genetic mechanisms remain incompletely mapped. Documentation of color stability across generations helps breeders distinguish true-breeding traits from transient environmental responses.

Breeders use chlorophyll phenotype markers as visual selection tools during plant scouting and phenotype hunting. Stable pigment expression serves as a secondary trait for strain stabilization and parent-plant identification within hybrid families.