Sour Diesel is one of the world's most popular cannabis strains. The Sour Diesel sativa strain has undetermined origins, although many believe it to have genetics of Skunk, Chemdawg, Northern Lights and a Mexican sativa. Like many sativas, Sour Diesel (also known as Sour D) boasts long, fluffy green buds decorated with orange hairs and sticky trichomes. Sour Diesel was named for its aroma and flavor, which is sour with pungent notes of diesel and skunk. Sour Diesel is stimulating enough for wake-and-bake sessions and daytime use, with THC levels ranging between 19 and 25 percent. Sour Diesel may help alleviate nausea, fatigue, depression, muscle tension and certain types of pain.