Answer: You can add a couple of inches of top soil but don't add any more than that or you may damage the surface roots. Or you can simply plant a ground cover beneath the tree to hide the exposed roots. Grass has a difficult time growing beneath trees. Usually there's too much shade for their liking and the soil is dry because of competition from the tree's feeder roots. I'd just plant some groundcover beneath the tree, without adding soil or making a large bed around it. Enjoy your garden!
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