Plant Phenotype

Plant phenotype refers to the observable physical characteristics of a cannabis plant—its height, branching structure, leaf shape, flowering pattern, and resin production—determined by both genetics and environmental conditions. Breeders and cultivators document phenotypes to understand how a strain expresses in different growing environments and to identify stable, reproducible traits across generations. Phenotypic variation within a single genetic line (genotype) can be significant; two plants from the same seed batch may show notably different structures, leaf sizes, or flowering speeds depending on light, temperature, nutrients, and stress factors. Understanding phenotypic expression is central to strain stabilization and the selection of elite parents for breeding programs. Cannabis phenotypes are often categorized as indica-dominant, sativa-dominant, or hybrid based on their growth

Breeders select and stabilize desirable phenotypes across multiple generations to create consistent, reproducible strains. Identifying phenotypes with favorable traits—compact structure, vigorous rooting, consistent flowering duration, or robust resin gland development—guides parent selection and inbreeding strategies.