Type I Type Ii Type Iii Chemotypes

Cannabis chemotypes are classified by their cannabinoid ratios, primarily THC-to-CBD proportions. Type I strains are THC-dominant (high THC, low CBD), Type II strains exhibit intermediate ratios of both cannabinoids, and Type III strains are CBD-dominant (low THC, high CBD). This classification system emerged from phytochemical analysis and has become foundational in breeding programs and regulatory frameworks. The chemotype of a strain is determined by genetics and environmental factors during cultivation. Understanding chemotypes helps breeders select parent plants for desired cannabinoid profiles and supports standardized communication across the industry.

Breeders use chemotype classification to strategically cross plants and stabilize specific cannabinoid ratios in offspring. Selecting Type I × Type I crosses typically produces Type I progeny, while controlled breeding with Type II or Type III parents allows development of novel intermediate profiles for diverse market segments and research applications.