Lawn Mowing: How to Mow Around Tree Trunks and Root Flares Without Wounding the Bark

The last pass around a trunk is where decks and string trimmers scar living wood. Learn a safer approach path, height habit, and mulch ring so trees and turf both survive the cut.

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FAQs

How wide should the mulch ring around a tree be?

Wide enough that the mower deck never needs to touch bark—often two to three feet out for young trees, larger as the canopy grows. Keep mulch off the trunk itself.

Can wounded bark heal on its own?

Small scrapes may callus over, but girdling and deep cuts often do not fully recover. Prevent the wound; do not rely on sealants as a fix.

Is it better to let grass grow against the trunk?

No. Grass against bark invites trimmer damage and moisture problems. A proper mulch ring is safer for both the tree and your mowing routine.

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