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  distance should be maintained when planting climbers beside an existing tree or shrub. 
 Clematis are happiest when their roots are kept cool and moist, so try to plant  them where the base of the plants will be lightly shaded by other,  lower-growing species. Otherwise, use a clematis root protector, or top-dress   the rootball (avoiding the immediate crown), with a generous layer of shingle  or pebbles. 
 Remove dead and damaged stems before growth begins in early spring, cutting all remaining stems back to where strong buds are visible. 
 Apply a slow-release balanced fertiliser and a mulch of well-rotted garden compost around the base of the plant - again avoiding the  immediate crown.