Mugwort (Artemisia princeps) belongs to the Asteraceae (the Aster family). It is a perennial herb that is native to Honshu, Shikoku, Kyushu of Japan, as well as widely in the Northern Hemispere. This herb grows on roadsides or in grasslands, and can reach 60-120 cm in height. The rhizomatous roots extend transversally. The stems are much-branched and covered with white wooly hairs. The many, pale purple-brown flowers bloom descending from August to October. The young shoot are used as a rice cake in spring. The dried wooly hairs are used as a fabric raw material of Moxa.