Are exposed tree roots a problem? "Fielding Questions" columnist Don Kinzler also answers reader questions about a white coating on a local lawn and if there are crack-proof tomato varieties.

Maple’s shallow root systems, combined with saturated soils, can cause problems. Maples are especially sensitive to standing water, which can quickly stress their roots.

When planting a new tree it is important to plant “high” with the root flare slightly above the soil surface and visible from all sides.