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10 summer-flowering clematis

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.

View larger images of the plants in this feature in our clematis image gallery.

Clematis 'Alaina'

Clematis ‘Alaina’

A new variety for 2012, ‘Alaina’ flowers from June to September. The deep pink blooms fade to a paler, sugary pink, with a prominent stripe. This free-flowering variety will reach 180cm in height. (Pruning group three.)

Clematis 'Fleuri'

Clematis ‘Fleuri’

The pointed tepals are a rich velvety magenta, with a blended central stripe that is slightly redder. Fleuri is suitable for growth in a pot and only reaches around 120cm in height. However it will flower prolifically, from May to October. (Pruning group three.)

Clematis florida 'Alba Plena'

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 three.)

Clematis 'Fond Memories'

Clematis ‘Fond Memories’

Large white, tinged with mauve flowers, adorn ‘Fond Memories’, tending to be more mauve in a shadier position. These are produced from July to October. ‘Fond Memories' can reach a height of 2.5m. (Pruning group three.)

Clematis 'Kingfisher'

Clematis ‘Kingfisher’

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 two.)

Clematis 'Picardy'

Clematis ‘Picardy’

Suitable for a container, 'Picardy' rewards with lots of relatively small, but prolific flowers. These are occasionally semi-double. Intensely dark new flowers become paler with age. (Pruning group three.)

Clematis 'Princess Diana'

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, it will reach a height of 3m. Plant it in sun or partial shade. (Pruning group three.)

Clematis 'Sonnette'

Clematis ‘Sonnette’

Gorgeous, dainty, urn-shaped flowers cover the plant from June to September. The tips of the petals curl backwards over the blooms, which are rosy pink. (Pruning group three.)

Clematis viticella 'Jolly Jake'

Clematis viticella ‘Jolly Jake’

This tough, robust violet-burgundy variety is new on the market for 2012. Prune it 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 three.)

Clematis 'Zara'

Clematis ‘Zara’

This variety is new to the UK for 2012. The large pale violet flowers appear from June to September, and remain consistent in colour. It can be grown up a wall facing any aspect. (Pruning group three.)

Thanks to the following clematis specialists who provided information on the plants in this feature:

Floyds Climbers and Clematis

Taylors Clematis

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