A type of tree or shrub that grows near water and is known for its soft wood and nitrogen-fixing ability.
From Old English 'alor' or 'aler,' related to Dutch 'els' and German 'Erle.' The tree was named descriptively and the word evolved through Germanic languages.
Alder trees are nature's nitrogen factories—they have a special relationship with bacteria in their roots that convert atmospheric nitrogen into usable fertilizer, making them pioneer plants that improve poor soil for other species.
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