Answer: Aspen will grow in your gardening region, especially Populus nigra 'Tialica', the Lombardy Popular. Betula pendula, the weeping white birch, is especially suited to your region and makes a lovely planting when grouped together. The trees will reach a mature height of 30'-40', spreading to half its height. Neither tree will cast a great deal of shade - the branches are spaced far apart and the leaves are rather small. If you're looking for a shade tree, consider Catalpa (vanilla bean tree) or fruitless mulberry (Morus). Both have large leaves and dense canopies. Hope this information helps you choose just the right tree for your landscape.
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