C. viticella From southern Europe this species has probably contributed more to the popularity of clematis in the garden than any other species. The form we propagate has 2-3" (5-8cm), deep rich-purple, slightly nodding flowers. As with all viticellas, C. viticella blooms profusely from June through August on a 10-12' (3-3.5m) plant. Pruning group C