Answer: Maple trees are notoriously difficult to grow lawn under. The canopies keep light and rain from reaching the ground and the roots steal moisture and nutrients from the soil. It is always a shame, however, to remove healthy trees, so you might consider using a ground cover instead, unless there is an overriding need for lawn grass. You could consider establishing a visual carpet of English ivy (Hedera helix) or the blue flowering periwinkle (Vinca minor) beneath the trees.
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