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Rhythm of the annual cycle

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 It almost always corresponds to the appearance of new leaves (whether the species is obsolete or persistent).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.
The growth of the trunk and branches occurs throughout the period of vegetative activity, from leafing to leaf drop. It results directly from the climatic conditions which influence the formation of the xylem. The diameter of the trunk and branches increases appreciably; this annual growth can reach and even exceed 3 cm.

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

Main forms of trees

Main forms of trees

Name of the treeGrowth afterHarbor
1 year5 years15 years
Birch1 m2 m10 mslim
Cedar of Lebanon1 m3 m6 mConical
chestnut1 m2 m6 mspread
Holm oak0.5 m1.5 m3.5 mRound
Cypress1.5 m3 m5 mcolumnar
Maple1 m2.5 m10 mRound
Ash1 m2 m6 mRound
Beech1 m2 m7.5 mspread
chestnut1 m2 m8.5 mRound
Larch2 m5 m8.5 mConical
Poplar1 m2.5 m9.5mcolumnar
Pine1.5 m3.5 m9 mConical
Weeping willow1.5 m2.5 m10 mweeper
thuja1 m3 m10 mConical
lime1.5 m2.5 m8 mIn a ball

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