Michigan Pure Pharms Durban Poison flower available in 1g. Durban Poison has deep roots in the Sativa landrace gene pool. The strain’s historic phenotypes were first noticed in the late 1970s by one of America’s first International strain hunters, Ed Rosenthal. Durban Poison has a dense, compact bud structure that’s typical of landrace Indica varieties, but the flowers’ elongated and conical shape is more characteristic of a Sativa.