If you are looking to add a large splash of purple and blue to your garden then you really must consider Clematis 'Semu'. This variety is known for it's velvety purple petals with blue undersides plus the features of hardiness and a tireless free-flowering habit. All that it requires from you in return is that it's cut back to just above ground level each year. The striking summer flowers are present from July to September and will be happy scrambling over walls, trellis, fences and any other support that you can offer it. Height: 3m (10'). Spread: 1m (3'). Pruning group: 3.