Lemon Kush is a citrus-scented cannabis strain with unknown genetic origins. Breeders often claim Master Kush and Lemon Joy are the cultivar’s parents. However, the breeders at Alien Genetics bred their own Lemon Kush strain by crossing Lemon G (also called Lemon G13) with a landrace Afghani Kush. Regardless of its heritage, Lemon Kush features a high limonene terpene content and THC levels that often test in the 20% range.