Plant Structure Leaf Shape

Leaf shape is a foundational plant structure classification that describes the morphological characteristics of cannabis foliage, including blade width, margin definition, serration patterns, and overall silhouette. Breeders and cultivators document leaf shape as part of phenotypic assessment, noting variations from narrow, thin-bladed "sativa-type" leaves to broader, more robust "indica-type" leaves. Leaf morphology is influenced by both genetic lineage and environmental conditions during growth. This trait has historical significance in cannabis taxonomy, though modern genetic testing has revealed that leaf shape does not always correlate with cannabinoid or terpene profiles. Understanding leaf shape characteristics helps cultivators identify phenotypic expressions within seed populations and supports consistent record-keeping across breeding programs.

Breeders select for specific leaf shapes to maintain cultivar identity, optimize canopy light penetration, and facilitate phenotype documentation in breeding records. Leaf shape consistency across generations can indicate stable genetic expression and helps distinguish between intentional crosses and accidental pollination.