Plant Density

Plant density refers to the physical structure and spacing of internodes, leaves, and flowers along the cannabis stem—a trait shaped by both genetics and cultivation environment. Strains with tight, compact node spacing are often called "dense" phenotypes, while those with wider spacing between growth points are described as "open" or "stretchy." This structural characteristic affects light penetration, air circulation, and biomass distribution within the canopy. Density patterns are frequently inherited, with some lineages consistently producing tighter architecture than others across different growing conditions. Understanding plant density is essential for breeders selecting parents for specific cultivation methods, from sea-of-green systems to natural light outdoor grows.

Breeders working in controlled environments prioritize tight density for efficient space use and uniform flowering, while outdoor and natural-light breeders may favor slightly open structures for disease resistance. Density traits can be intentionally combined with yield or stability goals through multi-generational selection.