European black alder, a type of screening tree
Photo: Martin Hughes-Jones/Alamy
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European Black Alder

European black alder
(Alnus glutinosa)
Zones 3–7

This oval-shaped deciduous tree is useful as an informal screen in a wet area or for edging a pond. Grows 40–60 feet high by 20–40 feet wide; thrives in full sun or part shade in wet soil where other trees might fail.
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