Narrow Leaflet Morphology

Narrow leaflet morphology describes cannabis plants displaying characteristically thin, elongated leaf blades—a heritable trait influenced by both genetics and environmental factors. This phenotype is commonly observed in sativa-dominant lineages and landraces from equatorial and tropical regions, where the leaf structure may reflect adaptation to specific growing conditions. Breeders working in this category often note that narrow leaflet expression correlates with extended flowering times and particular terpene profiles, though expression varies across individual plants within the same genetic line. The trait appears polygenic in inheritance, meaning multiple genes contribute to the final leaf width observed in mature plants. Documentation of narrow leaflet varieties provides valuable data for understanding cannabis morphological diversity across cultivation regions and breeding progra

Breeders selecting for narrow leaflet traits often do so to preserve sativa characteristics or to explore how leaf morphology relates to secondary metabolite production. Narrow leaflet phenotypes serve as visual markers in hybrid development and landrace preservation work.