Alnus rugosa: 20-35ʼ high x 20-35ʼ wide / full sun / zone 2
This is a versatile native nitrogen-fixer. It can be coppiced (that is, cut down in the winter to re-sprout in spring) every few years to keep it a manageable size; it tolerates wet feet and will improve the soil nearby. It also attracts bees.
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