Pure white flower spikes. Butterfly bush is an excellent perennial for months of color from early summer into fall. 
Buddleia carries dense, arching cones of fragrant flowers over deciduous, sometimes semi-evergreen foliage.
Called Butterfly Bush for the obvious reasons Butterflies swarm to their blooms all summer long.
Best grown in massed plantings in borders, cottage gardens, rose gardens or butterfly gardens 
Usually does not make a good single specimen shrub