Plant Structure Broad Leaves

Broad-leaf plant structure refers to cannabis phenotypes expressing wider, more expansive leaf morphology compared to narrow-leaf varieties. This trait is often associated with indica-descended genetics, though broad leaves can appear across diverse lineages depending on environmental factors and polygenic expression. Leaf width affects photosynthetic surface area, transpiration rates, and overall canopy architecture. Breeders working in this category often select for broad-leaf traits when targeting specific growth patterns, vigor indicators, or as markers for particular cannabinoid profiles associated with certain regional landraces. The distinction between broad and narrow leaves has been used in informal cannabis taxonomy for decades, though it represents a spectrum rather than a binary classification.

Broad-leaf phenotypes are valuable selection markers in breeding programs, often correlated with shorter flowering times and stockier growth habits. Growers and breeders monitor leaf width as a diagnostic trait for phenotype consistency and to predict mature plant architecture before flowering.