Mistflower

Mistflower (Eupatorium coelestinum) is an eastern U.S. native. Covered with blue-violet flowers from late summer until frost, it is low growing, creeps rapidly by rhizomes and makes a fine groundcover for shade. Also grows luxuriantly in full sun when provided with adequate moisture. Also commonly called Hardy Ageratum or Wild Ageratum. Hardy to Zones 5 - 10.