This potent indica hybrid, with a sativa/indica ratio of 10:90, can reach THC levels of up to 20%, which makes it one of the stronger medical strains around. Master Kush is a crossbreed of an original Hindu Kush strain and a pure skunk strain, though the exact genetics are unclear. These are among the strongest plants in the world. And Master Kush is one of the best-known strains in the world, winner of two Cannabis Cup awards and a personal favorite of Snoop Dogg.