Open Plant Structure

Open plant structure refers to cannabis phenotypes characterized by wider internodal spacing, looser branching patterns, and increased airflow through the canopy. Plants with this trait typically display more vertical growth habits and fewer leaves clustered around nodes compared to dense phenotypes. Breeders working in this category often select for open structures to reduce fungal pressure, improve light penetration to lower branches, and facilitate easier maintenance during cultivation. This classification is frequently observed in sativa-dominant lineages and equatorial landrace genetics, where environmental pressures historically favored expansive growth patterns. Open structure plants commonly require more vertical growing space but may offer improved yields per unit of light in certain production systems.

Breeders pursuing open plant structure often cross sativa-dominant or equatorial genetics with cultivars selected for this trait across multiple generations. Selection for increased internodal distance and reduced leaf density helps create cultivars suited to high-light environments and humidity-sensitive growing conditions.