Leaflet Width

Leaflet width refers to the physical breadth of individual cannabis leaf blades, measured across their widest point perpendicular to the midvein. This trait varies considerably across cultivars and is partly heritable, influenced by both genetics and growing conditions like light intensity and humidity. Breeders often categorize plants as narrow-leafed, medium-leafed, or broad-leafed based on this characteristic. Leaflet width has been loosely associated with certain strain families—for example, some Sativa-leaning genetics commonly display narrower leaflets, while Indica-influenced lines frequently show wider ones. However, significant overlap exists, and individual plants within a strain can vary. This morphological trait remains useful in plant identification and breeding selection programs.

Breeders track leaflet width as a morphological marker for phenotype classification and to support selective breeding programs targeting specific plant structures. Wider leaflets may correlate with increased light-capturing surface area under certain canopy conditions, making it a consideration in breeding for vigor and growth efficiency.