Clematis- Jackmanii Superba

Height:  4m (13 FT.)
Spread:  Variable (Variable)
Improved Jackmanii with profuse, bigger, rounded, dark violet blooms throughout summer. Vigorous vine with bright green, oval foliage. Prune in spring; blooms on current season's growth only. Requires well-drained soil, shaded roots and a support structure.
Zone: 2