Double Diesel is the offspring of the multiple-award-winning NYC Diesel and Sour Diesel strains, reportedly created by Southern Humboldt Seeds Collective (SoHum). This diesel double-down makes for a super-fuel flavor. However, this THC-heavy strain is said to also deliver sweet, earthy, citrusy tastes and aromas. Double Diesel is the sativa-dominant result of a cross between award-winning NYC Diesel and Sour Diesel. It has a unique fuel and grapefruit aroma.