We have very little information on this species and do not know if it will be hardy in Britain, though judging by its native range it should succeed outdoors in many parts of this country. The following notes are based on the general needs of the genus. Prefers a moist loamy soil. A greedy plant, inhibiting the growth of nearby plants, especially legumes.

Young leaves - boiled. Some caution is advised, see the notes above on toxicity.

Seed - sow spring in a cold frame. When they are large enough to handle, prick the seedlings out into individual pots and plant them out in the summer. Division in spring. Larger divisions can be planted out direct into their permanent positions. We have found that it is better to pot up the smaller divisions and grow them on in light shade in a cold frame until they are well established before planting them out in late spring or early summer.

Wet places in C. Japan. By streams and rivers, wet grassy places, grassy slopes and meadows, below 3000 metres.