Clematis are among the more versatile and diverse plants for any garden; few flowers can fill so many garden niches, from specimen plants to dwarf perennials, or container selections to multistory vines. Wherever they are found, their blooms never fail to induce rapture and awe. The carefully chosen clematis can't be equaled when planted in the right situation and pruned in the right way, but horticultural horrors can ensue when beginners (or experts)...