Seeds can germinate on the surface of water. Our vision is of a revitalised wild forest in the Highlands of Scotland, providing space for wildlife to flourish and communities to thrive. A mature alder supports a variety of moss and lichen species on its bark and branches. Its leaves decompose fairly quickly in water. We use cookies to ensure that we give you the best experience on our website. They vary in colour from pale yellow-green to deep red, and the mite itself lives on sap, which it sucks from the cell tissue of the tree. Leaves are mostly deciduous, only very few alders are evergreen.. Alder trees are found in all parts of the northern hemisphere and they are often found on poor and/or wet soil.,,,,, Its range also includes the Caucasus, Iran, Turkey and North Africa, where it is native to Tunisia, Algeria and Morocco. Like the birches, it is a pioneer species which grows quickly and is relatively short-lived. This nitrogen-fixing bacterium absorbs nitrogen from the air and makes it available to the tree. They also add nutrients to the water. Alders add nitrogen to the soil in the manner of legumes, and decomposing alder leaves improve soil structure. Common name (s): alder, common alder, black alder, European alder. long when they are fully open. in length, which are green in colour and grow in clusters of up to 4 at the end of twigs. The fruits of the brown cup fungus appear in spring, on alder catkins after they have fallen to the ground. Alder occurs at elevations of up to 500 metres. Its survival and expansion is essential to the health of the land and rivers alike. The brown roll-rim is one example. Forty-seven species of mycorrhizal fungi grow with alder. Trees for Life is a registered Scottish charity – number SC021303. They provide nutrients for invertebrates such as the larvae of caddisflies, stoneflies and water beetles. The alder tree is monoecious, which means it is both male and female, enabling it to self-pollinate. They then root when they are washed up on land. Alder trees thrive in full sun exposures where they receive at least eight hours of direct sunlight daily. Alder trees grow native across the United States, Canada, parts of north Africa, Russia, Iran, Turkey and Europe. It can reach 30 metres in height, although in Scotland it is rarely more than 20 metres tall. Branches are ascending in their growth form, and trees with two or three main trunks are common. VAT No. This gives rise to the second part of its botanical name, glutinosa , which means sticky. It can live to around 150 years old. Almost all of them are deciduous. The different types of alder trees include tall trees with single trunks and much shorter, multi-stemmed specimens that can be grown as shrubs. There are a wide variety of alder trees from which to choose: Sitka Alder: It has thin leaves and grows to about 25 feet in height at its full maturity. The bark is dark and fissured and is often covered in lichen. Flowers. Alder is found throughout Scotland, although its presence in Shetland is due to planting. A company limited by guarantee, registered in Scotland – company No. It can reach 30 metres in height, although in Scotland it is rarely more than 20 metres tall. Conical in shape, mature trees can reach a height of around 28m and live to approximately 60 years. Pollinated female flowers grow into ovoid fruits about 1.5 cm. Flowers. Seed is produced in small cones with pollen The empty cones can persist on the tree until the following spring and are a distinctive feature of the alder tree in winter. Alder is the common name for about 30 kinds of trees and shrubs of the Alnus genus.They are a part of the birch family (Betulaceae).Most of them are smaller in size. If you continue to use this site we will assume that you are happy with it. They then produce galls, which harden as the cones ripen. The Alder Tree is delicate in appearance, but is tremendously strong and is linked, as are many trees, with the creation of humans, for Irish legend tells how the first man was made from alder, and the first woman from rowan. Additional Information About Alder Trees. As a result it is often found in narrow bands along watercourses, although in the right conditions it can form alder carr, which is a type of wet woodland. These are fast-growing trees and shrubs, so they can be used to help fill in a landscape and provide shade sooner than other species.

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