Bistorta (Persicaria) tenuicaulis

A choice little woodlander – unlike any of the other common species. Slowly spreading to make a colony of stocky little plants with small silvery green leaves, and in spring, makes short spikes of pure white flowers with black anthers.
Adaptable but best in moist but well-drained woodsy soil in shade.
Never even slightly weedy. In fact, keep an eye on it or it might get lost.
1L pots ~ £6