To avoid dry conditions, and to ensure good soil contact around the rootball, we advise planting climbers at least 30cm (12in), and preferably 45-60cm (18-24in) away from the base of a wall or fence. An even larger d distance should be maintained when planting climbers beside an existing tree or shrub.

Plant in a sunny, sheltered spot with fertile, well-drained soil. Water regularly while it’s establishing, and apply a layer of mulch to retain moisture and suppress weeds. Provide a sturdy support or trellis for the climber and train young shoots along it, tying in gently.

Prune lightly after flowering to maintain shape and remove any weak or crossing stems; occasional harder pruning in early spring can rejuvenate older plants. Once established, it is fairly low-maintenance, producing abundant clusters of violet-blue flowers through summer.