Cultivar Phenotypes

Cultivar phenotypes refer to the observable physical and chemical characteristics expressed by a cannabis plant within a specific growing environment. While a strain's genotype remains constant, phenotypic expression—plant height, leaf structure, resin production, terpene profiles, and flowering time—can vary based on cultivation conditions, lighting, temperature, and nutrient availability. Breeders distinguish between phenotypes within the same strain line to identify which expressions are most stable and desirable for reproduction. Understanding phenotypic variation is foundational to cannabis breeding, as consistent phenotypes form the basis for standardized cultivars. Lineage records frequently document multiple phenotypes emerging from single-strain crosses, helping cultivators and seed producers make informed selections.

Breeders use phenotypic selection to stabilize desirable traits across generations, isolating phenotypes that consistently express target characteristics. Identifying and preserving elite phenotypes—often called 'pheno-hunting'—is a core breeding practice for maintaining cultivar integrity and predictability.