Answer: One hour of late afternoon sunshine shouldn't affect Japanese maples. They like dappled shade during the afternoon, but unless there is a lot of reflected heat during that one hour of sunshine, they should be able to adapt to the site. If you'd rather not take a chance, how about planting Ilex (holly) in the site? Or, instead of a tree, how about a large shrub that can be pruned into a tree shape? Camellia might work for you. Best wishes with your landscape.
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