Nearly every modern CBD strain traces back to a few founding lines discovered in the late 2000s when breeders started testing for CBD instead of just THC. Those early plants were mostly hemp crossed into drug type cannabis to raise flower quality. The lineage charts on https://calmcbdseeds.com show how the current catalogue connects to those origins, which explains why so many strains share a similar earthy profile. Newer lines are finally branching into fruitier terpene territory, which is welcome.