Sunday, March 15, 2009

Wall Plants

By John Hicks

Some climbers like ivy need no support other than that provided by their aerial roots whereas others, as for example the climbing roses, need tying in with string, plastic ribbon, webbing or a similar artificial aid.

Some climbers, of which, Actinidia chinensis and Polygonum baldschuanicum are prime examples, will swallow a house completely so quickly do they grow. Others like wisteria or clematis must be carefully pruned and trained, or the gardener is left to contemplate a naked expanse of stem. No matter what treasured climber is planted, the wall will provide a protection not enjoyed by the denizens of the open garden.

I grow C. alpina through and amongst deciduous rhododendrons. It comes so readily from seed that -some x)f my experimental plantings border on the reckless. Nothing, however, matches a plant I saw in the wild growing through Rhododendron ferrugineum. The blue flowers with a, central boss of white stamens overlaid the brick-red blooms of the rhododendron like a SpaniSh mantilla.

Actinidia chinensis will riot over an acre of wall in an undignified scramble. The large leaves, 6 to 8 in. across, and fragrant flowers are recompense enough if space can be provided, but really only a castle offers sufficient wall space and even then, should the drawbridge be left down, it could prove a liability for once inside it would take over the uppermost turret. A. kolomikta is a shrub of feminine complexity. It is incapable of deciding on a suitable leaf colour, the lower half remaining green while the upper half turns white and pink.

Climbers need not be confined to walls. Stumps of old trees, venerable apple or other fruit trees, chain-link fencing, indeed anything capable of supporting the extra weight. For climbers some support will be necessary and modern invention provides a richly varied choice. A well-made wooden trellis, plastic-covered mesh, vine eyes with wire stretched between, or a nail hammered in where required - there is something to suit every depth of pocket.

I use trellis or plastic-covered netting fitted to wooden bobbins 2 in. long, made by cutting up a broom shaft. This holds the plants out from the wall so that the air can circulate freely reducing the incidence of mildew and red spider mite. If wood is used anywhere as a support it should be treated with a good preservative first.

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