Alnus glutinosa

12 Dec

Alnus glutinosa (18/07/2015, Kew Gardens, London)

Alnus glutinosa (18/07/2015, Kew Gardens, London)

Position: Full Sun

Flowering Period: Spring

Soil: Well drained, Moist

Eventual Height: 25m

Eventual Spread:12m

Hardiness: 3a, 3b, a, 4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b, 9a, 9b, 10a

Family: Betulaceae

Alnus glutinosa Leaf (28/07/2012, Kew Gardens, London)

Alnus glutinosa Leaf (28/07/2012, Kew Gardens, London)

Alnus glutinosa is a fast growing deciduous tree with a broadly conical, upright growth habit. The leaves of the plant are rounded in shape, becoming wedge-shaped at the base, having slightly toothed margins. They are 5 – 10 centimeters short stalked and are 6 – 12 centimeters long. When young they are slightly sticky. The bark is dark grey and fissured. The monoecious flowers are wind pollinated catkins, the male ones being slender and cylindrical catkins, dark yellow/ brown in colour and 5 – 10 centimeters long. The female ones are smaller, 2 centimeters in length and red in colour, hard, somewhat woody and superficially similar to some conifer cones. When the small winged seeds readily propagate the alder. This tree suckers readily. Its roots form an association which enable them to fix nitrogen in the soil.

Alnus glutinosa Female Flower (28/07/2012, Kew Gardens, London)

Alnus glutinosa Female Flower (28/07/2012, Kew Gardens, London)

Alnus glutinosa, commonly known as the English Black Alder, European Alder and Common Alder, is native to most of Europe, including the UK. It is found around wetlands and bogs and is common throughout the UK.

The etymological root of the binomial name for Alnus is the old Latin name for Alder trees. Glutinosa is derived from the Latin  glutino meaning ‘sticky’ referring to the leaves. 

The landscape architect may find Alnus glutinosa useful as an uptight native street tree, due to its tolerance of urban pollution. It is suitable for planting as part of a native schemes, particularly in damp locations, it may also be coppiced. It may be used as part of a native hedge planting mix. It is also suitable in maritime locations.

Alnus glutinosa Bark (18/07/2015, Kew Gardens, London)

Alnus glutinosa Bark (18/07/2015, Kew Gardens, London)

Alnus glutinosa prefers most moist soils. It will tolerate most soils pH. It will not grow on acidic peat or shallow, chalky soils.

Ecologically, Alnus glutinosa  being a native tree is beneficial wildlife, over 140 plant eating insects have been recorded on alder. In secluded areas female otters are known to build their nests, known as holts, in the roots of alders.

Alnus glutinosa requires little to no maintenance. 

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  1. Ce păduri găsim în Delta Dunării? | Greenly Magazine - 03/07/2013

    […] fotografii: info-delta.ro, thewildflowersociety.com, davisla.wordpress.com, cas.vanderbilt.edu, […]

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