"The Spiraea 'Tor', Spiraea betuliflia 'Tor', is a compact Spiraea reaching a height and width of 2-3 ft. Its tiny white flower clusters are set against a backdrop of deep green leaves that are almost iridescent in the summer. Foliage turns a deep, purplish-red in the fall. The flowers are attractive to butterflies. Light shearing will encourage repeat bloom. Tor blooms on new wood, so pruning in late winter or early spring is recommended. Because of its small size and excellent attributes, Tor Spiraea makes a great foundation shrub."