Plant Phenotype

Plant phenotype refers to the observable physical characteristics of a cannabis plant—its structure, morphology, leaf shape, branching pattern, height, and flowering architecture. These traits result from the interaction between genetic inheritance (genotype) and environmental growing conditions. Phenotypic expression is central to cannabis breeding because breeders select for consistent plant forms that align with cultivation goals, extraction methods, or seed production efficiency. Understanding phenotype helps breeders identify which genetic lines produce predictable, stable plants across different grow environments. Phenotypic documentation is essential for strain registration, seed cataloging, and maintaining breeding records.

Breeders systematically evaluate phenotypes across plant populations to select parents with desirable structural traits—such as compact branching, predictable height, or favorable calyx-to-leaf ratios. Phenotypic consistency across generations indicates genetic stability and is a marker of true-breeding lines used in formal breeding programs.