Flowers: March – April; catkins, resembling small pine cones when old
Fruits: Small winged seeds
Twigs & bark: Twigs with raised orange spots; bark dark brown, fissured when mature
River-side and damp woods, basic to moderately acidic soils
Widespread and common
Records submitted to Data Centre in 2021
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Fast growing tree, quick to colonise. The wood is slow to rot, and is often used to make sluice gates in canals and were used to make round shields in ancient times.
Alnus glutinosa is a nitrogen-fixer. It has symbiotic relationship with a bacterium which are found in its root nodules. This improves the fertility of the soil. It is also an important pioneer species in ecological succession. The wood has been used for building, especially in water logged conditions due to its durability.