Big Sky Kush is a indica-dominant hybrid (15% sativa/85% indica) strain that is a potent cross between the popular OG Kush x Skywalker Kush strains. Big Sky Kush has an almost immediate onset. Big Sky Kush is a indica-dominant hybrid (15% sativa/85% indica) strain that is a potent cross between the popular OG Kush x Skywalker Kush strains. Big Sky Kush has an almost immediate onset.