Height Dominance

Height dominance refers to the genetic tendency of certain cannabis lineages to express tall, columnar growth patterns with extended internodal spacing. Breeders working in this category observe that some parental genotypes consistently produce offspring that reach above-average stature compared to standard cultivars. This trait is commonly associated with sativa-leaning genetics, though height expression is polygenic and influenced by both nuclear genetics and environmental factors such as light spectrum, photoperiod, and nutrient availability. Height dominance has practical implications for cultivation: taller plants require more vertical space, extended vegetative periods, and careful canopy management. Understanding this trait's heritability helps breeders select parents for either compact architecture or tall, open-structured cultivars depending on production goals.

Breeders use height-dominance data when developing cultivars for specific environments—tall types for outdoor production or greenhouse settings with high ceilings, compact types for controlled indoor systems with space constraints. Identifying parental genotypes that reliably produce height dominance allows targeted selection across generations.