High Thc Low Cbd

High THC/Low CBD cannabis describes genetics where tetrahydrocannabinol (THC) concentrations significantly exceed cannabidiol (CBD) levels, often with CBD present at <1% by dry weight. This classification emerged as breeders selectively cultivated for elevated THC potency during the late 20th century, particularly in North American and European breeding programs. The ratio reflects decades of focused selection rather than the broader cannabinoid profiles found in landrace or heritage cultivars. Most modern commercial cultivars fall into this category due to consumer demand and cultivation focus. Lineage records frequently report this trait as dominant across hybrid generations when one parent carries high-THC genetics. Understanding this classification is essential for breeders studying cannabinoid inheritance patterns and cultivar documentation.

Breeders working toward high-THC phenotypes typically employ repeated backcrossing to THC-dominant parents and select for trichome density and resin production markers. This classification serves as a baseline reference in breeding programs attempting cannabinoid ratio modification or stability testing.