Mandrake is a plant used in Greece during the 5th century BCE.
Though this gray-green leafed plant was poisonous, when properly handled, the mandrake made a powerful medicine, which in right amounts was said to help with conception, reduce pain, and provoke pleasant visions. Too much, however, would kill.
The traditional way to pick a mandrake plant was to circle it thrice and face west, while with a dancer singing erotic songs. This practice occasionally caused problems between people.