Tuesday, March 3, 2009

The Weather and Your Garden

By Kristen Edward

A rough guide to the selection of suitable plants can be gained from observing what grows in similar conditions in the wild. In exposed places in Europe one often finds silver birch, mountain ash (Sorbus aucuparia), pines (shrubby varieties are good on a roof), heathers and gorse. The trouble with any kind of wind break is that, although it lessens the wind pressure in one place, it may increase it elsewhere.

Plants need light to achieve growth, through the process of photosynthesis. You can take advantage of the microclimate in various ways to increase the amount of sunlight available to a plant. A slope, for example, may catch more of the sun's rays than fiat ground and the water of a small pond will reflect light, aiding the growth of nearby plants. However, some plants require less sun and more shade than others and too much solar heat results in excessive water loss.

The sun's rays are important because provide the source of energy used in the of photosynthesis, shown here for the tom plant. Solar energy, which is assimilated in the green parts of the plant, causes carbon dioxide (taken in from the atmosphere) to be combine into carbon monoxide and oxygen; they them combine with water brought up from the soil to make the starch which the plant needs in order to grow. Oxygen and water vapour are given.

Although a panoramic view is a great asset, the site from which you enjoy it is often exposed and windswept. As well as offering shelter, planting in the foreground (right) may improve such a view by breaking it up into a series of images. A wall with a window in it (far right) performs a similar function and literally frames the view

The lateness of late frost, for example, affects early planting, early sowing, fruit tree blossom, potatoes and the safe point at which to bed out dahlias and geraniums. At the other end of the season, it is a good thing to know when to take in plants which are not frost hardy.

The most common problem in the countryside is the direct force of the wind, whereas in town it is more often draught, or wind coming in sudden gusts which has been re-routed round buildings, that damages plants. Balcony and roof gardens may be particularly exposed to the wind. Wind breaks can be made from a variety of materials, including plants which do not themselves mind high wind speeds. Solid barriers create areas of turbulence so an open-work fence, a broken wall, a group of plants or another form of partial wind break may be the better solution.

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