20 seeds per packet. Inhabiting the open, grassy hillsides and mountains of Japan, China and Siberia, the tall stems of this clump forming, perennial plant in the Valerianaceae family bear clouds of long-flowering, dense, vivid yellow flower clusters well into autumn. A fantastic plant for insects. Height 1.8 metres. Sun to part shade in moist, well-drained soil. Warm germinator.