Monday, March 2, 2009

Climbing Shrubs

By Adam Parker

Climbing and scrambling shrubs are valuable assets that have few substitutes. Ideal for covering and concealing ugly walls and fences as well as for adding a touch of green to terraces, pergolas, archways and pillars are members of the genera Ainpelopsis, Aristolochia, Clematis, Euonymus, Hedera, Hydrangea, Lonicera, Rosa, Vitis and many others.

Important in park landscaping are climbing and rambling shrubs (common ivy, traveller's joy, honeysuckle) for walls, fences, arbours, pergolas and pillars. Shrubs may be further divided according to various criteria, e.g. fast-growing and slow-growing, thorny and non-thorny, but these distinctions are of lesser significance.

Shrubs have aesthetic value in the landscape, particularly in parks and gardens. The heart of every nature lover gladdens in spring at the sight of a rocky hillside with here and there the white flowers of blackthorn and hawthorn or the yellow blooms of the cornelian cherry. Just as lovely are the pink blossoms of dog rose scattered in the pastures or the yellow patches of common broom on heaths and at the edges of forests. Shrubs growing in woodlands or at the margins of forests are not so easily pollinated by the wind as their taller companions the trees and for that reason they are generally adapted for pollination by insects, hence their bright flowers.

The first group includes Caragana arborescens, Chaenomeles lagenaria, Crataeous laevigata (oxyacantha), Ligustrum vulgare, Lonicera tatarica, physecarpus opulifolius and Syringa vulgaris ; the second Berberis thunbergtz, Buxus sempervirens, Mahonia aquifolium, Prunus spinosa, Ribes alpinum, Rosa rugosa and Spiraea x vanhouttei.

The main characteristics that differentiate the shrub from the tree are the structure of the trunk and the height it attains. Unlike trees, shrubs generally have more than a single stem, branching close to the ground to form several thinner stems that grow to a maximum of 5-8 m in height.

These general criteria, however, do not always apply. Some species of shrubs may include specimens with a clearly evident main stem (Cornelian cherry, common buckthorn, English holly), and in rare instances some may even attain a height of more than 8 m (hawthorn, English holly). These general characteristics, however, apply to the majority of shrubs. - 16035

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