Open Structure Growth

Open structure growth refers to a plant phenotype characterized by increased internodal spacing and loosely-arranged lateral branching, resulting in greater distance between nodes along the main stem. This trait is frequently observed in sativa-leaning genetics and certain tropical landrace populations, where extended photoperiods historically favored vertical elongation and branch separation. Breeders working in this category often select for open structure to improve light penetration, air circulation, and ease of canopy management during cultivation. The opposite phenotype—compact, dense growth—is more common in indica-influenced lines and is sometimes preferred for controlled environments. Open structure presents different cultivation considerations: while it may require additional structural support, the improved airflow can reduce certain environmental pressures. This growth patter

Cannabis breeders working with open structure genetics prioritize this trait when developing cultivars suited to outdoor production, low-stress training systems, or environments requiring enhanced canopy airflow. Selection for or against open structure represents a fundamental breeding decision that cascades into decisions around plant height management, yield distribution, and overall cultivation