The alder is often an underestimated tree that thrives in wet soils where other trees struggle. With its nitrogen-fixing properties, this tree plays a crucial role in improving soil quality. As a pioneer species, the alder is one of the first trees to establish itself in new areas, preparing the ground for other species. This remarkable tree has perfectly adapted to life in wet conditions, featuring special air channels in its roots that allow it to survive in marshy soil. The alder is not only a master of adaptation but also an indispensable link in the ecosystem of wetlands and riverbanks.
An adult alder in its natural habitat
"Where the alder grows, the soil improves - a silent helper in the ecosystem."
Characteristics of the Alder
Life Span
60-120 years
Height
20-30 meters
Leaves
Round to oval
Bark
Dark gray, grooved
Bloom
Catkins in spring
Fruits
Alder cones
Did you know?
- The wood becomes even harder underwater
- Venetian buildings rest on alder piles
- The tree can fix nitrogen from the air
Seasonal Characteristics
Spring
Early catkins appear
Summer
Dark green canopy
Autumn
Remains green for a long time
Winter
Characteristic cones visible
Known Alder Species
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Black alder (Alnus glutinosa)
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White alder (Alnus incana)
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Green alder (Alnus viridis)
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Gray alder (Alnus x pubescens)
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Italian alder (Alnus cordata)
Frequently Asked Questions
Why does an alder like to grow in wet soil?
Alders have adapted to wet conditions and have special air channels in their roots that allow them to survive in marshy soil.
What are alder cones?
These are the woody fruits of the alder that remain on the tree throughout the year. They contain small winged seeds.
How does an alder improve the soil?
Through symbiosis with bacteria, the alder can fix nitrogen from the air and store it in the soil, making the ground more fertile.
Nature Tip
Plant alders as natural bank protection along ponds or waterways - they help prevent erosion.
