Phenotype Classification

Phenotype classification systems organize cannabis plants by observable traits—morphology, growth pattern, resin production, and chemical profiles—rather than genetic ancestry alone. Breeders use standardized phenotype descriptions to communicate plant structure, leaf shape, internode spacing, and cannabinoid/terpene expression across populations. A single genotype may produce multiple phenotypes under different environmental conditions, making phenotype notation essential for breeding records and strain stability assessment. Classification frameworks range from simple visual keys (e.g., "wide vs. narrow leaflet") to detailed morphological standards used in seed catalogs and breeding archives. Understanding phenotypic variation helps breeders select parents, predict offspring traits, and maintain consistency in commercial seed lines.

Breeders routinely phenotype seedling and flowering plants to identify desirable traits, cull undesirable morphologies, and stabilize phenotypic ranges across generations. Phenotype data informs parent selection, hybridization strategy, and batch consistency documentation.