Cbd Recessive

CBD-recessive refers to cannabis plants expressing notably low cannabidiol (CBD) levels relative to THC, a phenotype determined by recessive genetic markers at the CBDA synthase locus. Plants exhibiting this trait typically show CBD:THC ratios below 1:20, sometimes approaching trace amounts. This is the inverse of CBD-dominant cultivars and represents the historical baseline of most THC-forward breeding lines developed over recent decades. Breeders working with CBD-recessive genetics often do so inadvertently when selecting for high-THC potency, as the trait is genetically linked to prevalent modern cultivars. Understanding CBD expression patterns is essential for breeding programs aiming to create balanced cannabinoid profiles or deliberate high-THC lines.

Breeders identify CBD-recessive plants through cannabinoid testing and use them as parent material when targeting THC-dominant cultivars or when conducting crosses where cannabinoid ratios need predictable outcomes. Recognizing this trait helps breeding programs avoid unwanted CBD expression in lines intended for specific cannabinoid targets.