Stigma Coloration

Stigma coloration refers to the visible pigmentation of a cannabis plant's pistils—the hair-like reproductive structures that emerge from the flower. These pistils commonly display colors ranging from white and cream to orange, red, pink, and purple, with coloration developing progressively through flowering. Stigma color variation is influenced by both genetic expression and environmental factors including light exposure, temperature, and plant maturity. Breeders have long observed stigma coloration as a phenotypic marker, though the underlying genetics remain incompletely characterized. Documentation of stigma colors serves as a practical tool in strain differentiation and harvest-readiness assessment across breeding programs.

Breeders often track stigma coloration patterns as a visual phenotypic trait for strain documentation and line stabilization. Selecting parent plants with consistent stigma expression can help establish recognizable strain signatures across generations, though this trait's inheritance mechanisms are not yet fully understood at the genetic level.