Broad Leaf Phenotype

The broad leaf phenotype describes cannabis plants expressing notably wide, expansive leaflets relative to their length—a structural trait influenced by genetics and environment. This morphology appears frequently in indica-dominant lineages and certain landraces adapted to shorter growing seasons or specific geographic regions. Breeders working in this category often select for broad leaves as they correlate with particular growth patterns, light interception efficiency, and historically, regional breeding populations. The trait is distinct from leaf serration (edge patterns) and blade count, though these characteristics may co-occur in the same genetic background. Broad leaf expression can vary significantly across phenotypes within a single strain, particularly in F1 and F2 generations.

Breeders tracking broad leaf phenotypes use this trait as a selection marker when stabilizing indica-leaning lines or creating hybrids targeting specific plant structures. The trait's heritability makes it useful for identifying parental contributions in crosses and establishing visual sorting criteria in early-stage selection work.