Single Stem Phenotype

Single stem phenotype describes cannabis plants that exhibit a dominant central main stem with minimal lateral branching. This growth structure is typically observed in specific genetic backgrounds and growing conditions, particularly under high light intensity or in sativa-dominant lineages. Breeders studying plant architecture note this phenotype can affect canopy management, light penetration, and harvest logistics. The expression of single-stem growth is influenced by both genotype and environmental factors, including photoperiod, nutrient availability, and spacing. Understanding this phenotype is relevant for cultivation optimization and breeding programs focused on specific plant structures.

Breeders working with plant architecture often select for or against single-stem phenotypes depending on production goals. This trait influences yield structure, requiring different training methodologies compared to naturally branching varieties, and is documented across sativa-dominant and hybrid lineages.