Height Phenotype

Height phenotype refers to the observable variation in plant stature across cannabis genetics, ranging from compact dwarfism to tall, extended growth patterns. These differences are polygenic traits influenced by both genetic background and environmental factors including light intensity, photoperiod, and nutrient availability. Breeders have documented height variation across major lineages—Indica-dominant strains typically express shorter, bushier architecture, while Sativa-dominant lines often develop taller, more elongated structures. Height phenotype is a primary selection criterion in breeding programs because it directly impacts cultivation efficiency, yield density, canopy management, and indoor/outdoor suitability. Understanding height expression helps breeders develop cultivars suited to specific growing constraints and production models.

Professional breeders select for height phenotype to create cultivars optimized for particular environments—compact phenos for space-limited indoor grows, taller phenos for outdoor and greenhouse production. Height genetics are often stabilized across F2–F4 generations to produce predictable, uniform plant architecture within a cultivar line.