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'Sylvia Denny' Clematis Plants

Clematis 'Sylvia Denny'Feefo logo

The details

  • Pure white flowers
  • Semi-double or single rosettes
  • Repeat flowering May-Jun & Sept
  • To 3m x 1m
  • Pruning group 2
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£ 19.95

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About 'Sylvia Denny' Clematis:

'Sylvia Denny' flowers beautifully and profusely with semi-double flowers in summer and again with single ones in September. These pure white rosette blooms are a true classic originating in Lancashire.

Perfect for container growing and spectacular against a dark background or on walls, arbors or pergolas, it's fully hardy and has a compact growth form.

Take a look through our clematis collection.

Great for your garden:

'Sylvia Denny' will be happiest in alkaline or neutral soil and will do well in full sun or partial shade in any aspect. It is vigorous and fully hardy, and flowers profusely, with only light pruning required.

This clematis is fabulous for setting off against dark hedges such as holly or yew. With a compact habit, it is contented in containers and so could be used for a more formal effect than a rambling clematis. You could shade the base with other low growing plants.

'Sylvia Denny' Clematis characteristics.

  • Flower colour: Pure, white flowers with yellow anthers
  • Flower shape: Semi-double rosettes in the summer and singles in the autumn
  • Fragrance: No scent
  • Repeating: Yes
  • Approximate flowering season: May - June, September
  • Final height and spread: 3m x 1m
  • Pruning Group 2

Look out for:

Clematis slime flux. Its an uncommon bacterial infection but can be fatal. It happens when the plant has an injury and bacteria infect the wound. Signs include wilting and yellowing of the leaves, as well as the unpleasant slime in the stems where the plant is affected.

Earwigs, aphids, and fungal infections can also affect Clematis


The Denny family are a kind of clematis dynasty based in Lancashire. There are a whole series of clematis named after local towns and family members. This particular one was named by Stephen Denny. Sylvia and Vince Denny started the nursery and named other cultivars after their grandchildren.

This variety was released in 1983, and the parents are Duchess of Edinburgh and Marie Boisselot.

Images supplied by Clematis on the Web.

Planting and Care Instructions

How to grow 'Sylvia Denny' Clematis:

'Sylvia Denny' Clematis can be grown easily following the Clematis planting guide.

  • Prune in early spring, by cutting back dead growth to just above the new buds.
  • Although it likes the sun, do protect the base and roots with shade or a mulch.
  • When planting in containers, keep them moist but well drained, and protect from frost.
  • Pinch our new shoots to encourage bushy growth.
  • It may take two years before it puts on its best display.