Answer
What trees are good for a small garden?
Small ornamentals like amelanchier, crab apple, multi-stem birch or acer, sited sensibly.
In short
Small ornamental trees such as amelanchier, crab apple, multi-stem birch and Japanese maple give height, structure and seasonal interest without outgrowing the space or threatening foundations. The key is choosing the right ultimate size and rootstock and siting it sensibly, which a planting plan handles.
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