RHS Other common names
water nerveroot
Bogs Herbaceous Perennial
A thick-stemmed perennial with dense stems and narrow, mid-green leaves up to 15cm long. Clusters of dark purplish-pink flowers are produced from the upper part of the stems from mid-summer to early autumn, followed by narrow, upright seed pods up to 7cm long, green at first then turning pale brown before splitting to release the seeds with their parachutes
Position
Full sun
Soil Types
Clay, Loam, Sand
Max Height
1-1.5 metres
Max Spread
0.1-0.5 metres