"Sakura-tade" (Persicaria conspicua) belongs to Polygonaceae (the Knotweed family). It is a perennial herb that is native from Honshu to Shikoku, Kyushu in Japan, as well as the Korean Peninsula and China. This herb grows in rice fields or bogs of water's edges, and can reach 40-90 cm in height. The rhizomatous roots are elongated and much-branched in the ground. The stems are erect, the leaves are lanceolate and alternate. The spikes are borne on the stem apices, and the pale rose pink flowers bloom from August to October. It is dioecious. The pistils of female flower are longer than stamens, and the pistils of male flower are shorter than stamens.