Care of the tree Alnus glutinosa or Common alder |
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The genus Alnus, family Betulaceae, comprises 30 species of trees and shrubs distributed throughout the planet. Some species are: Alnus glutinosa, Alnus rugosa, Alnus rubra, Alnus cordata, Alnus incana. Common names: Common alder, Alder, Black alder, European alder. This species is native to Europe, southwest Asia and northern Africa. They are elegant deciduous trees that reach 25 meters (82 feet) in height; they can live more than 100 years. The leaves can be oval, rounded or heart-shaped. They have male flowers (hanging catkins 10 cm/3.9" long) and female flowers (egg-shaped catkins). Although they produce cone-shaped fruits, they are not coniferous. They are used on the banks of lakes or rivers and in gardens as isolated specimens. Alnus glutinosa needs exposure to full sun or semi-shade, warm temperatures and moist soil. These trees can grow in all kinds of soils, better not calcareous. They improve the soil because their roots retain nitrogen. The irrigations will be abundant because it requires a high humidity on land; they do not tolerate drought. They do not need pruning or fertilization. They can be propagated by woody cuttings once the danger of frost has passed and from seeds sown in spring. |
Images of the tree Alnus glutinosa or Common alder |
 Alnus glutinosa  Alnus glutinosa  Alnus glutinosa  Alnus glutinosa |