Buddleia Monarch® 'Glass Slippers' (Glass Slippers Butterfly Bush)Pale periwinkle blue flowers Silvery foliage Rounded form Flowers from June through September Drought tolerant Deer resistant 'Glass Slippers forms a relatively low, wide spreading, tightly knit cushion topped with pale periwinkle blue blossoms held on silvery, branched stems from late summer into early fall. Secondary flowers extend the show further into fall. Hardiness Zone 5 9 Height 2 3 ft Spread 4 5 ft