Provides a welcome burst of color to the late season landscape, ‘Purple Dome’ is a compact heavy blooming variety which displays excellent resistance to mildew. Used as a mixed border plant, and cut flowers have exceptionally long vase life. Grow in any well-drained soil. Mulch to keep shallow roots cool in summer. For a compact display of flowers, pinch back in early summer. Keep on the dry side in fall and winter. Plants need to be divided every few years, preferably in the spring, in order to keep the plant vigorous.