Cultivar Phenotype

Cultivar phenotype refers to the observable physical and chemical characteristics expressed by a cannabis plant grown under specific environmental conditions. While genotype determines the genetic potential, phenotype is the result of that genetic blueprint interacting with factors like temperature, humidity, light spectrum, nutrients, and growing medium. A single strain's genetics can produce notably different phenotypes across environments—variations in leaf structure, internodal spacing, resin production, and terpene profiles are common. Understanding phenotypic expression is central to breeding work, as breeders must grow multiple iterations of the same genetic line to identify stable, desirable traits worth stabilizing into new cultivars.

Breeders select parent plants by evaluating phenotypes across multiple grows; identifying a phenotype that consistently expresses desired traits is the first step toward strain stabilization. Documenting phenotypic variation helps breeders understand which traits are genetically fixed versus environmentally triggered.