Climbing clematis are wonderfully showy plants that produce huge blooms over a long period. They grow well in borders and patio pots, climbing up pergolas, obelisks and trellis, adding valuable height to the garden.
Give plants a weekly feed with tomato fertiliser in summer, and deadhead to prolong flowering. If growing clematis in a pot, choose a large container and repot every two years into John Innes No. 3 compost with added slow-release fertiliser. Mulch the surface to protect the roots from hot sun.
Summer-flowering clematis need pruning annually. If they flower in May/June (Group 2 clematis), trim them at the end of June, then cut back to strong buds in February/March. Those that flower in late summer are classed as Group 3 clematis, and need to be pruned as set out in our advice on winter-pruning clematis.
When buying clematis, choose plants that are at least two years old (in 2-3 litre pots) to ensure the roots are well developed before planting.
Discover 10 pretty summer clematis to grow, below.
Clematis ‘Warszawska Nike'
This clematis has velvety purple flowers in late spring to early summer, and autumn. Grows to a height of 3m. Pruning Group 3.
Clematis florida ‘Alba Plena’
Double, greenish white flowers appear from June to October. Plant this variety in full sun, to achieve long stems of up to two metres. ‘Alba Plena’ can be grown in a container. Pruning Group 3.
The large blooms are prolific in May and June and may then disappear until September. To encourage more, cut the stems back in the July lull. 'Kingfisher' is not suitable for growing in deep shade. Pruning Group 2.
Clematis ‘Princess Diana’
This texensis type of clematis flowers from June to September, with vibrant pink long slim tepals, set off by bright green foliage. One of the tallest of these clematis, 'Princess Diana' will reach a height of 3m. Plant it in sun or partial shade. Pruning Group 3.
This viticella clematis tolerates shade and grows to a height of 3.5m. Pruning Group 3.
Clematis viticella ‘Jolly Jake’
Prune this tough, robust violet-burgundy variety down to 20cm in February, to benefit from lots of flowers on new growth, or allow it to scramble through a trellis and flower on branch ends. Pruning Group 3.