Plant Structure Growth Form

Plant structure and growth form describe the physical architecture and developmental pattern of cannabis plants—including height, branching density, internode spacing, and overall canopy shape. These traits are determined by genetics, environmental conditions, and cultivation technique, and vary significantly across cultivars and regional populations. Breeders often categorize plants as compact/bushy, tall/leggy, or intermediate based on their natural growth tendency. Understanding growth form is essential for indoor and outdoor cultivation planning, as structure directly influences light penetration, pest management, and harvest efficiency. Historical landrace populations from different regions typically express distinctive growth patterns shaped by local climate and traditional cultivation methods.

Breeders select for specific growth forms to suit target production environments—compact phenotypes for indoor cultivation with height constraints, and taller or more open structures for outdoor sun cultivation. Growth form traits are often polygenic and environmentally plastic, making phenotype selection across multiple generations important for stabilizing desired architectural characteristics.