Covering Exposed Tree Roots: How Much Soil Is Safe?

Surface roots are common on maples (especially silver maple). They grow just below the surface for oxygen. Erosion or traffic exposes them.

Oxygen Is Critical

Feeder roots absorb oxygen. Adding too much soil suffocates them—like a pillow over your face. Coarse soil blocks less oxygen than heavy clay.

Recommendation

Cover only the permanent, woody roots near the trunk with 2 inches of quality planting soil (not cheap topsoil). Do not add soil over feeder roots beyond the drip line.

Mulch Instead of Grass

Fescue struggles in shade under trees. Use 2 inches of wood chips (fresh chips okay if ≤2 inches). Mulching the entire drip line eliminates root/grass competition and mimics woodland conditions.