Blade Count

Blade count refers to the number of leaflets radiating from a single petiole (leaf stem) on cannabis plants. Most cannabis phenotypes display either 5, 7, or 9-blade configurations, though variations like 3 or 11 blades occur less frequently. Blade count is a heritable trait influenced by both genetics and growth stage—seedlings and early vegetative plants often show fewer blades than mature plants. This characteristic has been used historically in strain documentation and breeding records to distinguish plant morphology. Blade count can also be affected by environmental stress, nutrient balance, and light conditions during development. Understanding blade count patterns helps breeders track lineage consistency and identify potential genetic markers across generations.

Breeders monitor blade count as a morphological identifier when stabilizing F1 or IBL (inbred line) genetics, since consistent blade expression can indicate genetic stability within a cultivar family. Some breeding programs selectively work with specific blade-count phenotypes as part of their documentation standards.