Visual Phenotype

Visual phenotype refers to the observable physical characteristics of cannabis plants—leaf shape, plant structure, bud morphology, coloration, and growth pattern—that result from genetic expression and environmental interaction. These traits are distinct from chemical profiles (cannabinoids, terpenes) but often correlate with them in breeding populations. Visual phenotypes have been used informally for decades to classify plants before modern genetic testing became standard. Breeders document visual traits across generations to track heredity, identify markers for desired characteristics, and maintain consistency within strain families. Understanding visual phenotypes helps contextualize historical strain descriptions and breeding goals, though appearance alone cannot reliably predict chemical composition or other growing characteristics.

Breeders use visual phenotypes as primary selection criteria in early generations before chemical analysis, allowing rapid identification of parent plants with desired structural or morphological traits. Consistent visual markers can indicate stable genetic lines and help breeders track inheritance patterns across crosses, though final cultivar selection typically incorporates chemical and growth-