Large pink flowers with yellow centres appear in summer over the shamrock-like foliage and open wide in the sunshine. A very lovely plant that spreads by unusual little pea-sized 'bulbs', for all the world like tiny, dark brown onions. These remain dormant over winter, fairly near the surface, and leaves suddenly appear in late spring. Flowers quickly follow. Only 5cm (2") or so high.
Although spreading, it is never a nuisance and can look wonderful in a small trough, perhaps under a Salix Boydii or dwarf Spiraea.