Stratification

Stratification in cannabis genetics refers to the layering or separation of distinct phenotypic expressions within a strain population, often observed across generations or within large seed batches. This term describes how genetic diversity manifests visibly—plants from the same cross may display noticeably different plant structures, growth rates, or aromatic profiles. Stratification is particularly relevant in F1 and F2 generation work, where recessive traits begin segregating and creating observable variation. Breeders document stratification patterns to understand underlying genetic architecture and to identify which traits breed true versus which remain heterozygous. Understanding stratification helps distinguish between stable cultivars and genetically complex populations still stabilizing across generations.

Breeders use stratification documentation to map trait stability and identify candidate plants for further line selection. Recognizing stratification in early generations informs decisions about population size, backcrossing strategy, and breeding timeline toward a homogeneous cultivar.