Stems 1.5-3 (-4) m. Unbranched or sparsely branched. Rhizome creeping, horizontal, deep-lying (70-100 cm below soil surface). One plant can cover an area of 30 square meters. Leaves shortly petiolate, oblong, 20-40 cm x 10-20 cm. Inflorescence short, axillary, flowers white. V - mid spring to late autumn. Fl - July for one month. Fr - September, not every year. Propagated by division (runners) and seed. Grows in full sun and also in partial shade. Creates a herbaceous thicket and can grow in sites of low maintenance. Z 4.

Far East (southern Sakhalin, southern Kuril Islands) and northern Japan. Along streams, on gravelly and sandy soil, among shrubs. Also creates a tall-herb formation.