Fine textured grey-green foliage forms a mound that gives rise to masses of double voilet-blue flowers starting in May and continuing into July. Strong rebloom starting in August. Long blooming and reblooming. Perfect for massing in the front of a garden or for use in mixed perennial containers. Great fall color source. Easy to grow . Thrives in full to half day sun. Feed yearly with an organic fertilizer. Prune in late winter or very early spring to remove damaged foliage and to revitalize.