Leaflet Width

Leaflet width refers to the breadth of individual leaflets that comprise cannabis fan leaves, a morphological trait influenced by both genetics and environment. Breeders observe leaflet width as part of broader leaf architecture assessment, noting variations from narrow to broad across different lineages. This trait is commonly associated with indica-dominant versus sativa-dominant genetic backgrounds, though environmental factors—light intensity, humidity, and nutrient availability—significantly affect expression. Leaflet width can influence light interception efficiency and plant airflow characteristics, making it relevant to cultivation strategy decisions. Lineage records frequently document leaflet proportions as part of phenotype descriptions, helping breeders track and stabilize desired plant structures across generations.

Breeders working in controlled-environment cultivation often select for specific leaflet widths to optimize canopy management and light penetration. Wider leaflets are sometimes favored in humid environments to reduce disease pressure, while narrower leaflets may improve airflow in dense canopies.