Cannabis Chemotypes

Cannabis chemotypes refer to distinct chemical profiles within the species, primarily differentiated by cannabinoid and terpene ratios rather than visual traits. The most recognized classification divides plants into Type I (high-THC dominant), Type II (balanced THC/CBD), and Type III (high-CBD dominant), though some frameworks include additional categories. Chemotype expression is influenced by both genetics and environmental conditions, making it a complex breeding consideration. Historical landrace populations often displayed consistent chemotypes, which modern breeders have isolated and stabilized through selective breeding. Understanding chemotypes is fundamental to cannabis genetics work, as they determine biochemical output independent of plant morphology or growth characteristics.

Breeders use chemotype selection as a primary tool for developing stable lines with predictable cannabinoid profiles. Identifying and fixing chemotype expression requires multi-generational testing and environmental standardization to ensure trait consistency.