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Replace organic mulch every one to two years, depending on the variety. Wood chips and straw, for example, will last a couple of years, while grass clippings and pine needles need replacing every several months. Inorganic mulch—such as rock and rubber chips—can stay in place for up to four years, depending on erosion and general garden upkeep. 

The best time to lay mulch depends on the type of mulch and the reason for installing it: 

• Summer: Adding extra mulch helps soil retain moisture and keeps weeds at bay, allowing plants to thrive. 

• Fall: Adding mulch helps control weeds and keeps soil and roots warm during the cooler months. Aim to add a layer of mulch 2 to 4 inches deep.

• Winter: Mulch around perennial plants to help keep them insulated.

• Spring: Wait until the ground has thawed. Depending on the thickness, add between 1 and 4 inches of mulch to provide freeze and rain protection and enrich the soil.

A light layer of mulch can help protect a tree, retain moisture, and keep the soil healthy. However, it’s important to avoid over-mulching or piling the mulch up around the trunk of a tree, a practice notoriously called “volcano mulching.” That piled mulch can increase the chances of rot and disease on the tree trunk as well as overwhelming the soil, which needs access to a certain amount of air. Topped trees have it hard enough: mulch sparingly while they heal.

Yes, rotting leaves can be good for your soil. The decaying leaves release nutrients into the soil that can boost the health of your plants, and the organic matter also helps improve airflow and water drainage.