Clematis 'Xerxes', also known as Clematis 'Elsa Spath', produces magnificent blooms for months on end. From June to September, the hardy climbing shrub's violet flowers complement its green foliage, which is easy to maintain due to its moderate growth habit. This climber is particularly effective at adding a splash of colour to sunny or semi-shady walls and fences. Height: 3m (9'11); Spread: 1m (3'3); Pruning group: 2.