Blue Mist Caryopteris (also commonly called blue spirea or bluebeard) is a low-mounded, deciduous shrub that is valued for its aromatic foliage and late summer flowers which are said to resemble clouds of blue smoke or mist. The plants typically produce about 18-30 inches of growth per year, so total shrub height (usually from 2-3) depends in large part upon the extent of winter dieback and/or the annual spring pruning. Longwood blue is a taller cultivar which may reach a height of 4. It feature ...