Narrow Leaflet Phenotype

The Narrow Leaflet Phenotype refers to cannabis plants exhibiting distinctly thin, elongated leaflets—a morphological trait often observed in certain lineages and growing environments. This characteristic contrasts with broader-leafed phenotypes and is frequently documented in sativa-dominant genetics and specific regional cultivars. Narrow leaflets may correlate with lighter leaf density and altered light penetration through the canopy. The trait's expression is influenced by both genetic inheritance and environmental factors including light spectrum, humidity, and nutrient availability. Breeders and cultivators monitor leaflet morphology as a visible marker of plant structure and potential growth patterns, though the trait itself does not directly indicate potency or cannabinoid profile.

Breeders working with sativa or sativa-dominant lines often observe and selectively stabilize narrow leaflet expression as part of structural breeding goals. This phenotype can influence canopy architecture, airflow management, and cultivation planning, making it a tracked trait in lineage documentation and pheno-hunting protocols.