Clematis is a genus with around 385 species from the Ranunculaceae family. Thes are popular herbaceous climbers, grown for their huge range of flower shapes and colours, and sometimes evergreen foliage. Clematis are generally divided into three main groups according to where and when their flowers are produced. They are spring-blooming clematis that flower on side shoots of the previous year's stems; summer or autumn blooming clematis, which flower only on the ends of new stems (current seasons growth); and twice-flowering clematis that flower on both side shoots and terminally. Most species in this genus are hardy, with a few exceptions.