Sour Diesel or “Sour D” has an almost mythical reputation among its die-hard fans and numerous repeat growers. This feminized, sativa-dominant seed was created by crossing Skunk and Chemdawg. Its potency is superb, even those with a high tolerance would point to Sour Diesel as one of the strongest strains available today, thanks to THC levels that regularly exceed 20% in a well-conditioned grow room. But perhaps the characteristic for which it is most praised is the unique terpene profile that smells like freshly spilled gasoline.