Certainly one of the most popular of foliage perennials, this forms a low cushion of ferny, silvery-grey leaves. In areas with humid summers, Silver Mound benefits from a hard clipping just as the tiny silver ball-like flowers appear, usually in mid to late June. Plants will regrow quickly and remain attractive all season long. Good for hot, dry sites. Nice edging plant, also combines well with other perennials in tubs or mixed containers. Divide every two to three years (in spring or fall) in order to maintain good vigour.