Plural of alder; multiple alder trees, which are hardwood trees with catkins that typically grow in wet areas.
Simple plural form of alder, from Old English alor, ultimately from Proto-Germanic *aliz-, possibly related to words meaning 'other' or referring to the tree's different characteristics compared to other trees.
Alder forests are ecological powerhouses—the trees form partnerships with nitrogen-fixing bacteria in their root nodules, essentially fertilizing the soil around them, which is why they pioneer recovery in disturbed wetlands.
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