Apical Dominance

Apical dominance refers to the botanical phenomenon where a plant's main central stem (apex) grows more vigorously than lateral branches, creating a tall, narrow canopy structure. In cannabis cultivation, strains exhibiting strong apical dominance typically develop a single primary cola with smaller branching below, while weak apical dominance produces more balanced lateral growth and multiple equal-sized tops. This trait is influenced by auxin hormone distribution and genetic background, with many sativa-leaning lineages commonly associated with stronger apical dominance and indica-leaning genetics often showing reduced apical dominance. Breeders routinely observe and select for apical dominance patterns as a morphological marker, since the trait directly impacts canopy architecture, light penetration, and training response.

Breeders working with apical dominance leverage this trait to predict growth form consistency across generations. Selecting parent plants with defined apical dominance patterns helps establish predictable phenotypic expression, particularly valuable for cultivators planning training or scrogging strategies.