Mulching is one of the simplest and most effective ways to ensure the health and longevity of your trees, but it’s often done incorrectly. When applied properly, mulch helps retain moisture, suppress weeds, regulate soil temperature, and improve soil quality. However, when misused, it can harm your trees.
The first rule of proper mulching is to avoid the dreaded “mulch volcano”—piling mulch high against the tree trunk. This traps moisture against the bark, leading to rot, disease, and pest issues. Instead, aim to spread mulch in a flat, doughnut-shaped ring around the base of the tree, keeping it 2 to 4 inches deep and at least 2 to 3 inches away from the trunk itself.
Use organic mulch, such as wood chips, bark, or shredded leaves, which breaks down over time and enriches the soil. The mulch ring should extend out to the tree’s drip line if possible, where most of the absorbing roots are located. This gives the tree the most benefit and protects roots from lawnmowers and foot traffic.
Refresh mulch annually by lightly raking and adding a thin new layer. Don’t just keep piling more on top, as this can lead to overly deep mulch and oxygen-starved roots.
With just a little effort, proper mulching gives your trees a healthy boost and enhances the beauty of your landscape. Done right, it’s a small step with big benefits for tree care.
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