Common Name: Butterfly Bush
‘Black Knight’ is a butterfly bush cultivar which features almost black flowers. It is a deciduous shrub with an arching, spreading habit which typically grows 6-8′ tall if not cut back in late winter and 4-5′ tall if cut back. Features spike-like 4-10″ long terminal clusters of very dark purple flowers which bloom from June to September and sometimes to first frost. Flowers are fragrant.