Internode Length

Internode length refers to the distance between successive nodes (leaf attachment points) along a plant's main stem and branches. This morphological trait is a key breeding consideration, as it directly influences plant architecture, canopy structure, and cultivation efficiency. Shorter internodes typically produce denser, more compact plants, while longer internodes create more open, airy structures. Breeders working in cannabis genetics have selected for varying internode lengths depending on growing environment, training methods, and desired phenotypic outcomes. Internode length is largely determined by genetic background and environmental factors including light intensity, photoperiod, and temperature during vegetative growth.

Breeders manipulate internode length through selective crosses to optimize plant structure for specific cultivation systems—compact varieties suit small spaces and SOG setups, while longer-internode plants may better utilize vertical space in larger operations. Understanding internode genetics helps predictably develop cultivars suited to particular growing conditions and training protocols.