It is also important to know which shrubs do well in dry locations and which require greater moisture. The first group of barberry, golden rain, bladder senna, box thorn and Japan rose, the second willows the shrub height, the alder buckthorn, red dogwood, French tamarisk and other shrubs.
A second general rule is that the better the other conditions of a given site the less will be the plant's need of light. That means that in poorer climates or where soil is less fertile the need of light is greater providing there is adequate moisture. This is illustrated by the fact that woody plants tolerating moderate shade under optimal ecological conditions become light-loving plants in the northern, areas of their distribution.
Light-loving shrubs that do not tolerate much shade are the barberry, dog rose, quince, common broom, smoke tree and tamarisk. On the other hand, there are shrubs that grow better in the shade of trees, e. g. the box, rhododendron, red dogwood and white dogwood, Oregon grape, common elder, privet, alder buckthorn and mezereon.
Garden hybrids and forms with differently coloured flowers or foliage, larger fruit and different habit of growth cannot be relied upon to come true to type when raised from seeds.
However, they are unable to obtain water from the frozen soil to replace that which has evaporated and the result is that later in spring they turn brown and dry up. For that reason shade-loving evergreen shrubs should never be planted in places fully exposed to sunlight from the south.
Shrubs may be propagated by vegetative means with varying degrees of ease. In some species all one need do is cut off a branch, insert it in the ground and within one to two years it will grow into a young shrub that can be transplanted. Other species are better multiplied by summer cuttings of soft leafy shoots. Some shrubs cannot be multiplied by stem cuttings at all. In such cases it is necessary to use root cuttings.
A second general rule is that the better the other conditions of a given site the less will be the plant's need of light. That means that in poorer climates or where soil is less fertile the need of light is greater providing there is adequate moisture. This is illustrated by the fact that woody plants tolerating moderate shade under optimal ecological conditions become light-loving plants in the northern, areas of their distribution.
Light-loving shrubs that do not tolerate much shade are the barberry, dog rose, quince, common broom, smoke tree and tamarisk. On the other hand, there are shrubs that grow better in the shade of trees, e. g. the box, rhododendron, red dogwood and white dogwood, Oregon grape, common elder, privet, alder buckthorn and mezereon.
Garden hybrids and forms with differently coloured flowers or foliage, larger fruit and different habit of growth cannot be relied upon to come true to type when raised from seeds.
However, they are unable to obtain water from the frozen soil to replace that which has evaporated and the result is that later in spring they turn brown and dry up. For that reason shade-loving evergreen shrubs should never be planted in places fully exposed to sunlight from the south.
Shrubs may be propagated by vegetative means with varying degrees of ease. In some species all one need do is cut off a branch, insert it in the ground and within one to two years it will grow into a young shrub that can be transplanted. Other species are better multiplied by summer cuttings of soft leafy shoots. Some shrubs cannot be multiplied by stem cuttings at all. In such cases it is necessary to use root cuttings.
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In garden planning, round boulders and flat slabs must be skilfully balanced together to build a dry stone wall in the garden.
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