Dense and well- branched shrub covered with pale-blue clusters. Buddleia Sky Blue is low growing, wide spreading butterfly bush covered from top to bottom with pale-blue clusters. With dense and well- branched plants Glass Slippers is very manageable and practical for use in patio containers. Buddleia is commonly known as butterfly bush, a deciduous shrub native to China. It typically grows to 6-12’ tall with a spread to 4-15’ wide when not killed back by cold winter temperatures. It is noted for its bushy habit, arching stems, showy, fragrant flowers and vigorous growth. Spike-like flower clusters bloom from early summer to first frost. Flowers are mildly fragrant, and very attractive to butterflies, hummingbirds and bees.