Rhythm of the annual cycle
Like all plants, trees and shrubs are subject to the rhythm of the annual cycle which is followed by a period of activity and a period of rest. Unlike many others (flowers, vegetables), the period of activity corresponds to a period of growth. Except for certain species or varieties, the growth of the trees is in the direction of the height. Very important when the subject is young, it decreases with aging to reach a limit point at which the tree only fills, while its height no longer changes. The activity of the tree then tends towards its consolidation (enlargement of the trunk, development of the antlers and roots).
The annual growth of the tree takes place over a very short period of time, which rarely exceeds one month. It almost always corresponds to the appearance of new leaves (whether the species is obsolete or persistent). For most species, the growth mechanism begins with bud break, continues with leaf emergence, then wood growth, and ends with the formation of a new terminal bud. For some species, growth exceeds the usual late spring limit and continues throughout the summer.
- In a first case, the importance of growth depends on the weather conditions of spring.
- In a second case, the tree is forced to tap into its reserves: growth depends on the weather conditions of the previous year.
Growth rate and magnification vary considerably from one species to another.
There are fast species, which generally correspond to light-loving subjects, and slow species that prefer shade. The seconds usually live longer, without this being an absolute rule. In all cases, the longevity of trees remains higher than that of humans, the most "fragile" still exceeding 150 years.
Port and growth of the main trees of our regions
|Name of the tree||Growth after||Harbor|
|1 year||5 years||15 years|
|Birch||1 m||2 m||10 m||slim|
|Cedar of Lebanon||1 m||3 m||6 m||Conical|
|chestnut||1 m||2 m||6 m||spread|
|Holm oak||0.5 m||1.5 m||3.5 m||Round|
|Cypress||1.5 m||3 m||5 m||columnar|
|Maple||1 m||2.5 m||10 m||Round|
|Ash||1 m||2 m||6 m||Round|
|Beech||1 m||2 m||7.5 m||spread|
|chestnut||1 m||2 m||8.5 m||Round|
|Larch||2 m||5 m||8.5 m||Conical|
|Poplar||1 m||2.5 m||9.5m||columnar|
|Pine||1.5 m||3.5 m||9 m||Conical|
|Weeping willow||1.5 m||2.5 m||10 m||weeper|
|thuja||1 m||3 m||10 m||Conical|
|lime||1.5 m||2.5 m||8 m||In a ball|
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