When there is little else blooming in the garden in late summer and early fall, this flowering perennial shrub is there to delight us, and the butterflies. The common name Blue Mist refers to its fluffy, cloudlike flowers. 'Dark Knight' features fragrant dark blue-purple nectar-rich flowers that the butterflies, hummingbirds and other beneficial pollinators will enjoy as a late season snack. This light airy shrub quickly reaches an average size of 3 to 4 feet tall and wide with attractive, fragrant, grey-green leaves. A sensory charmer in smaller garden spaces or large containers, or in groupings or as a colorful hedge in larger spaces. This beauty is tolerant of drought, resistant to pest and disease, and is seldom browsed by deer. Get all the details below!