There are quite serious revival 'traditions' of witchcraft (utterly unrelated to Wicca, which is a fully modern syncretic religion), which draw from what historical information there is, about practical folk magics in order to recreate contemporary equivalents.

One of the most interesting things about Traditional Crafters, is that they will often not shy away from the use of native hallucinogens (poisonous and narcotic herbs) as a form of trance induction - which is of course, possibly one of the most central elements of what would have been "real" Medieaval witchcraft.