Poor heat and dwindles quickly.
Alders consist of a group of 36 deciduous species, all part of the 'birch' family. They are native to the northern temperate regions of the world, where they grow in damp conditions, quite often alongside rivers and watercourses.
The most frequently found alder in the British Isles is the:
Alder, common
A native of Britain, but also found throughout the rest of Europe as far as Siberia, alder is a characteristic tree of wet places, marshes and stream-sides.
Alder, common
A native of Britain, but also found throughout the rest of Europe as far as Siberia, alder is a characteristic tree of wet places, marshes and stream-sides.
What other names does it have?
Can also be known as |
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Generic name | Alder |
Latin name | Alnus glutinosa |
Family name | Birch |
Latin family name | Betulaceae |
What type of tree is it?
Is it a broadleaf or conifer? | It is a broadleaf |
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Does it lose its leaves in autumn? | Yes, it is deciduous |
Species description:
Average height | 18-25m |
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Leaf
Description | Racquet-shaped and leathery with serrated edges. The tip is never pointed and is often indented. |
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Shape | Oval |
Colour | Dark green |
Leaf bud | Generally mauve (but can be duller and grey). The buds are club shaped and stalked. |
Leaf stalk | Long stalk |
Leaf arrangement | Alternate |
Flower, seed, and fruit
Type of flower | Catkin |
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Flowering season | February to early April |
Fruit colour | Brown |
Type of seed body | Cone |
Seeds dispersed by |
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Bark and twig
Bark description | Dark brown. Square plated/cracked with the verticals dominating |
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Twig Description | Brown and notched. Hairless |
What other trees are similar?
Can easily be confused with? | Downy alder - the leaves of which are larger, double toothed, and often downy |
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Where is it usually found?
Is it native or non-native to the British Isles? | Native |
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Where is its natural range? | Britain and Ireland |
Preferred soil type or environmental conditions? | Wet areas such as river sides, wet woods, marshes and bogs. Often planted on land reclamation sites. |
What is its British conservation status? | Common |
Additional information
Human uses of tree and timber | Alder timber is very resistant to decay under water and was therefore used for water pipes, pumps, troughs, small boats and piles under bridges and houses. In fact, much of Venice is built on alder piles. The two other main uses of alder wood are charcoal and for making clogs. Alder was popular for charcoal as it was particularly favoured in gunpowder. Clogs made from alder wood were light, easy to wear and absorbed shocks well. |
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Tree lore and folklore | Alder wood is a lure for woodworm, (as the beetles lay their eggs in alder in preference to other wood), so branches were cut and put in cupboards to prevent woodworm in other woods. There are few other folklore assocations. Except, in Ireland it was thought to be unlucky to pass an alder on a journey. Possibly because alder grows in marshy ground! |