Persicaria amplexicaulis 'Alba' 
White Bistort
Location
The Tennis Court and Temple Gardens
Description: 
An herbaceous perennial forming a clump to 1m in height, with large, prominently veined ovate leaves and small white flowers borne in dense, long-stalked spikes to 10cm in length in summer and early autumn
Site and Care:
Ideal for a moist soil, of any type, although it can tolerate some dryness in full sun or partial or open shade. Propagate by division in spring or autumn.