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In the fields of horticulture and botany, the term deciduous (/ d ɪ ˈ s ɪ dʒ u. ə s /) [1] [2] means "falling off at maturity" [3] and "tending to fall off", [4] in reference to trees and shrubs that seasonally shed leaves, usually in the autumn; to the shedding of petals, after flowering; and to the shedding of ripe fruit.
Autumn leaf color is a phenomenon that affects the normally green leaves of many deciduous trees and shrubs by which they take on, during a few weeks in the autumn season, various shades of yellow, orange, red, purple, and brown. [1]
Annual autumn leaf drop in temperate zones is caused by the abscission of the mature leaves from the growth season in response to the approach of cold winter weather. Abscission (from Latin ab- 'away' and scindere 'to cut') is the shedding of various parts of an organism, such as a plant dropping a leaf, fruit, flower, or seed.
As daytime and nighttime temperatures decrease, trees change colour and then shed their leaves. [11] Persians celebrate the beginning of the autumn on Mehregan. Under the traditional East Asian solar term system, autumn starts on or around 8 August and ends on or about 7 November.
The annual ritual of trees shedding leaves has been underway for several weeks. The changing colors and dropping leaves are signs that fall is upon us, and winter is not far behind. While most ...
Marcescence is most obvious in deciduous trees that retain leaves through the winter. Several trees normally have marcescent leaves such as oak (Quercus), [5] beech (Fagus) and hornbeam (Carpinus), or marcescent stipules as in some but not all species of willows . [6] All oak trees may display foliage marcescence, even species that are known to ...
In the great majority of genera the leaves are evergreen, usually remaining on the plant for several (2–40) years before falling, but five genera (Larix, Pseudolarix, Glyptostrobus, Metasequoia and Taxodium) are deciduous, shedding their leaves in autumn. [1]
Leaves shed in autumn tend to have a very low nitrogen content and are often dry. Their main constituents, cellulose and lignin , are two recalcitrant molecules resistant to degradation. [ 4 ] [ 5 ] Because of this, autumn leaves break down far more slowly than most other compost ingredients which may take a very long time on their own.