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Posted on 10:16 AM by Wanto and filed under
By Susan Ferguson
Trees are divided roughly into three groups according to their rate of growth - fast, moderate and slow-growing.
The first group is distinguished by fast growth in the first years with culmination point at an early age, after which the rate markedly decreases. The tree usually has a short life. Fast-growing trees, therefore, do not attain great heights; on the contrary, these are attained by the moderate and slow-growing over a greater period of time, and reaches its peak at a more advanced age; the downward curve is more protracted and the tree has a longer life span (fir, spruce, beech).
Germination takes place if conditions are suitable, i.e. in adequate temperature and humidity. The absorption of water promotes not only the growth of the embryo plant and the rupturing of the seed coat, but also the conversion of the reserve food supplies stored within the seed. The quantity of water the seed absorbs is enormous - 40 to 100 per cent of the dry weight of the seed.
The annual increase in height is fairly rapid in most trees, occurring within the brief period of four to five weeks. Growth I wgins at the same time as the tree comes into leaf. For the first few days it is slow, then comes a period of rapid growth - one to two centimetres a day - followed by one to two weeks of slower growth, and ending with the appearance of a terminal bud at the tip of the shoot. This way of growth is characteristic of the Scots pine, spruce, fir, ash, beech and many others, the period usually terminating at the end of June.
There is, however, another group of trees, whose annual growth is spread out over the whole period of vegetation and lasts from three to four months. Included in this group are the poplar, alder, birch, cypress, larch and dawn redwood.
In planting new forests, willows and poplars are grown directly from cuttings, as are most ornamental trees and shrubs. Some trees can also multiply by their pendulous branches touching the soil and sending out roots. Their tips then grow upward, and new individuals are formed. This method is characteristic of the Norway spruce in high mountain areas, the lime growing in stone debris or parks, the arbor-vitae and many ornamental shrubs.
The first group is distinguished by fast growth in the first years with culmination point at an early age, after which the rate markedly decreases. The tree usually has a short life. Fast-growing trees, therefore, do not attain great heights; on the contrary, these are attained by the moderate and slow-growing over a greater period of time, and reaches its peak at a more advanced age; the downward curve is more protracted and the tree has a longer life span (fir, spruce, beech).
Germination takes place if conditions are suitable, i.e. in adequate temperature and humidity. The absorption of water promotes not only the growth of the embryo plant and the rupturing of the seed coat, but also the conversion of the reserve food supplies stored within the seed. The quantity of water the seed absorbs is enormous - 40 to 100 per cent of the dry weight of the seed.
The annual increase in height is fairly rapid in most trees, occurring within the brief period of four to five weeks. Growth I wgins at the same time as the tree comes into leaf. For the first few days it is slow, then comes a period of rapid growth - one to two centimetres a day - followed by one to two weeks of slower growth, and ending with the appearance of a terminal bud at the tip of the shoot. This way of growth is characteristic of the Scots pine, spruce, fir, ash, beech and many others, the period usually terminating at the end of June.
There is, however, another group of trees, whose annual growth is spread out over the whole period of vegetation and lasts from three to four months. Included in this group are the poplar, alder, birch, cypress, larch and dawn redwood.
In planting new forests, willows and poplars are grown directly from cuttings, as are most ornamental trees and shrubs. Some trees can also multiply by their pendulous branches touching the soil and sending out roots. Their tips then grow upward, and new individuals are formed. This method is characteristic of the Norway spruce in high mountain areas, the lime growing in stone debris or parks, the arbor-vitae and many ornamental shrubs.
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When you plan your garden, keep in mind the rough positioning of the main functional areas, mark in the broad sweep of the garden design.
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