If this herb be within a house there shall no whyches, spyryte abyde ( The Grete Herball, 1539)
Mugwort is a popular herb once used by the Celts in tea and to season vegetables, but now it is mostly used in magic. If rubbed on a crystal ball, scrying bowl, or magic mirror, it will increase the strength. William Colese, in The art of simpling, said, " If a footman take Mugwort and put it into his shoes in the morning, he may goe forty miles before noon and not be weary."
Taken from: Celtic Folklore Cooking~ Joanne Asala Page 176