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Yes, mulch can attract pests. Spiders, centipedes, and ants are some common pests that are attracted to mulch. You can avoid infestation by laying your bags of mulch in the heat for a few hours or by using an inorganic mulch, as it’s less attractive to pests.

How tall your mulch should be around your tree depends on the type of mulch you use, but aim for 3 to 4 inches as a rule of thumb. You’ll want to avoid simply piling it up in hopes of offering additional benefits to your tree. Volcano mulching is the infamous term for piling way too much mulch against the stem of your tree. This could actually kill your tree or severely harm it, as your tree trunk needs space to breathe without too much moisture.

How much 4 yards of dirt will cover depends on how deep you want the soil to be. In general, a yard of dirt will cover 324 square feet for a 1-inch depth or 100 square feet for a 3-inch depth. Therefore, you can expect 4 yards to cover between 400 and 1,296 square feet if you keep your soil depth between 1 and 3 inches.

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.