Roots are becoming more exposed on large Sunset Maple
We have a sunset maple, planted in a pine island at the front of the house (dirt was brought in to raise and mound tree above pine island level). It is now about 15 feet and and 25 feet tall. The tree appears to be very healthy, but the root system is becoming more and more exposed (very large roots), over the years. Should we cover the roots with dirt and/or mulch? We do not want to lose this tree or ignore a potential problem, but we also do not want to do anything that would harm the tree.