Petasites japonicus, also known as fuki(フキ（蕗、苳、款冬、菜蕗）), bog rhubarb, Japanese sweet coltsfoot or giant butterbur, is an herbaceous perennial plant in the family Asteraceae. It exists not only in Japan, but many places in Europe. It is especially commonly found around Swiss alps. It has also been introduced to southern British Columbia by Japanese immigrants.