Cbd Dominant Ratios

CBD-dominant ratios refer to cannabis cultivars where cannabidiol (CBD) concentration exceeds tetrahydrocannabinol (THC), typically in profiles of 1:1 or higher CBD:THC, or pure CBD-only phenotypes. These ratios emerged from selective breeding programs beginning in the early 2000s, driven by breeders seeking to stabilize non-intoxicating chemotypes. Lineage records frequently report CBD-dominant cultivars descending from landrace hemp varieties and high-CBD phenotype selections within traditional cannabis germplasm. Breeders working in this category often employ backcrossing and test-cross methodologies to stabilize the CBDA synthase enzyme expression while minimizing THCA synthase activity. Understanding CBD:THC ratios is fundamental to genetic classification systems used in seed banks and breeding registries across regulated markets.

Breeders use CBD-dominant ratio selection to develop cultivars for markets with cannabinoid ratio regulations and to create parental lines for balanced 1:1 crosses. Achieving stable CBD dominance requires multi-generational phenotype screening and molecular marker-assisted selection to ensure consistent chemotype expression across offspring.