Also termed foamflower, the genus Tiarella contains around 8 hardy perennials, some of which are evergreen. Distribution ranges across Asia and North America. Foliage is generally hairy, rounded and toothed and sometimes also lobed palmately. Flowers are small, star-shaped and coloured pink or white, arranged in panicles or racemes in clusters. This genus is well-placed as groundcover for moist soils in shade locations, spreading growth occurs through the use of runners.