Witchcraft is closely intertwined with the green world. The Green Man, one of the pagan deities, embodies the abundance of nature. The Druids revered trees and believed that the sacred World Tree connected the upper, middle, and lower worlds. A Greek myth explains that the daughters of Hecate (one of the patronesses of witchcraft) taught witches how to use plants for both healing and magick, and throughout history witches have practiced herbalism. Today's Wiccans and witches are continuing to expand humankind's knowledge of the plant kingdom.