Broad Leaflet Phenotype

The Broad Leaflet Phenotype describes cannabis plants exhibiting wider, more spatulate leaf geometry compared to narrow-leaflet morphologies. This trait is commonly observed across indica-dominant and hybrid lineages, though it appears independently across diverse genetic backgrounds. Leaflet width is influenced by both nuclear genetics and environmental factors including light intensity and photoperiod. Broad leaflets are frequently associated with shorter internodal spacing and denser canopy structure. Historical breeding records indicate this phenotype emerged prominently in mid-20th-century hash-plant and Afghani-derived lines, though the underlying genetic markers remain incompletely characterized.

Breeders working with broad-leaflet morphologies often select for structural density, light-penetration efficiency, and stability under variable cultivation conditions. The trait's heritability makes it useful as a visual marker during early-generation selection, though phenotypic plasticity requires controlled growing environments to reliably distinguish genetic from environmental expression.