Open Structure

Open structure refers to cannabis plants that develop with loose, airy branching patterns and wide spacing between nodes, creating a naturally spread-out canopy. This architecture contrasts with dense or compact growth forms and is influenced by both genetics and environmental conditions. Plants with open structure often exhibit extended internodal distances and lateral branch development that remains relatively thin or wispy rather than heavily filled. Breeders working in this category frequently study how open-structure genetics interact with light penetration, airflow patterns, and susceptibility to fungal pressures. This trait family has historical importance in indoor versus outdoor cultivation strategies, where environmental control can either amplify or suppress structural tendencies.

Breeders select for or against open structure depending on cultivation goals—some value improved canopy airflow and disease resistance, while others prioritize denser yields. Understanding structural genetics is essential for developing cultivars suited to specific grow environments and training methodologies.