Leaf Blade Serration

Leaf blade serration refers to the saw-tooth or jagged edge pattern along cannabis leaflet margins, ranging from deeply serrated to nearly smooth. This trait exists on a spectrum and varies within individual plants across different leaf ages and canopy positions. Serration patterns are influenced by both genetics and environmental conditions, making them useful markers in phenotype identification but not absolute classifiers. Breeders document serration intensity as part of morphological record-keeping, though it remains secondary to flowering time, structure, and resin production in most breeding programs. The trait appears across diverse genetic backgrounds and cannot reliably predict cannabinoid or terpene profiles on its own.

Cultivators monitoring leaf serration patterns use it as one phenotypic descriptor when selecting parents for stable lines or identifying phenotypic variation within seed lots. Sharp serration is sometimes anecdotally associated with certain landrace or indica-dominant lineages, though environmental factors (light, humidity, nutrient profiles) significantly influence expression.