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Mulching around trees is one of the simplest ways to protect them, yet it’s also one of the most common things done wrong. A good layer of mulch holds moisture, keeps soil cooler and keeps mowers and string trimmers away from the trunk. A bad layer can rot bark and weaken roots.
The biggest mistake is the “mulch volcano,” a tall pile heaped against the trunk. Mulch packed against bark keeps it wet, which invites rot, insects and disease. It can also encourage roots to grow up into the mulch and circle the trunk. Arborists recommend pulling mulch back a few inches from the trunk so the base, called the root flare, stays visible.
Depth matters too. A layer roughly two to four inches deep is usually enough. Thicker layers can block air and water from reaching the soil.
Width is where many yards fall short. Tree roots spread far beyond the trunk, often past the edge of the canopy. A wide ring of mulch, as far out as practical, protects more of those roots than a small circle.
Material matters a little. Shredded wood and pine straw work well in Florida. Many homeowners like recycled wood chips from tree crews, since they break down slowly and feed the soil. Rock and rubber don’t add anything to the soil and can trap heat.
Mulch also needs a refresh now and then. Old mulch breaks down, so topping it up once or twice a year keeps the layer even. Before adding more, it’s smart to rake the old layer and check that it hasn’t crept back up the trunk.
Homeowners in Pinellas County who want help keeping their trees healthy can turn to Arbor Wise Tree Service for tree care and advice.
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