Broadleaf Phenotypes

Broadleaf phenotypes refer to cannabis plants expressing notably wide, flat leaf blades relative to their petiole length—a morphological trait influenced by genetics and environmental factors. This classification encompasses plants where leaflets span wider than typical narrow-leaf cultivars, often appearing in indica-dominant lineages and certain hybrid crosses. Broadleaf expression is distinct from leaf count (serration) and relates primarily to lamina width; plants may display 7, 9, or 11 leaflets but exhibit broader individual blades. Breeders have observed broadleaf traits correlating with specific regional populations and landrace ancestry, particularly from Hindu Kush and Central Asian breeding stocks. The trait is polygenically controlled and can shift between vegetative and flowering phases depending on light, temperature, and plant maturity.

Breeders selecting for broadleaf phenotypes often track this trait as a marker for yield potential and plant structure stability. Broadleaf morphology is commonly associated with vigor and internodal density, making it a practical selection criterion in structured breeding programs, though expression remains environment-dependent.