K.O. Kush Feminised Cannabis Seeds by Heavyweight Seeds: K.O. Kush is an indica dominant strain and a seriously heavy hitter in all departments. Heavy yields and high, KO is a must for lovers of all things Kush. A short, dense plant, it grows outwards and not upwards with an abundance of bud covered side branching. In fact, the bud to leaf ration is so good it makes KO Kush is really easy to manicure. Good mould resistance also makes it a great choice for growers in cooler climates. With both sky high THC levels and big harvests, KO Kush is without doubt the main contender from heavy weight seeds.