Purple-twig dogwood is notable for its dark purple-black stems in winter. This multi-stemmed shrub bears white flowers in spring followed by whitish blue fruit in summer. The foliage is dark green and turns a reddish-purple in the fall.

Members of the genus Cornus, commonly known as dogwoods, are welcome in the home garden for their multi-season interest -- be it flowers, fruit, foliage, and/or bark -- and their range of forms from small trees to suckering shrubs. The dominant display, however, varies among the species.

Dogwoods are native to cooler temperate areas of North America and Asia. The genus includes 45-60 species, divided into subgenera about which taxonomists disagree. The Chicago Botanic Garden's collection includes almost 100 varieties of dogwood from 20 species (7 of which are native) and over 2,400 plants.