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Caryopteris × clandonensis 'Dark Knight'
Common Name: blue mist shrub
Blue mist shrub is aptly named as its gray-green foliage is shrouded in a cloud of blue from mid to late summer. It is a well-behaved garden plant that is very attractive to butterflies. 'Dark Knight' has deep purple blue flowers closely spaced on long stems.
Height: 2-3 Feet
Spread: 2-3 Feet
USDA Hardiness Zone: 5-9