White-flowered red bistort 'Alba',  is an upright, clump-forming perennial, producing large, oval, pointed leaves, topped with narrow spires of small, bell-shaped, white flowers from midsummer to early autumn. 

Persicaria amplexicaulis, commonly known as bistort, is a herbaceous perennial that typically grows in a dense leafy mound and is native to the Himalayas. Tiny white flowers bloom June to September (occasionally to first frost) on narrow, pencil-thin, long-stalked spikes.  Plants often form large clumps over time. 

Although not invasive, this plant is best sited in locations where it has room to spread. Plants perform best when protected from strong winds.