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Generally, it is not necessary to remove old mulch before applying a new layer. As organic mulch breaks down, it enriches the soil with nutrients. However, you should remove the old layer if it shows signs of fungus or disease, which can be common in moist areas, or if the total depth is already too thick. Avoid letting the total mulch depth exceed 3 inches, as this can harm plant roots. If you do remove old, disease-free mulch, it can be added to a compost pile.

There are several ways to decompose yard waste quickly. The first step is to move all debris into a compost bin or pile. From there, microorganisms, bacteria, and insects will break down the yard waste into compost. To speed things up, shred the waste into smaller pieces, add live worms to the pile, or introduce nitrogen-rich compost accelerators like grass clippings, coffee grounds, and manure. Turn the compost over every few days. This process, called aerating, allows oxygen to get in and accelerate decomposition.

Unless it’s rubber or you need to prune suckers and remove weeds, you shouldn’t need to get rid of the old mulch around your tree. Simply push old mulch a few inches away from the trunk of your tree and then top it off with enough fresh mulch to reach 3 to 4 inches in height.

Remove household junk, construction debris, yard waste, and old appliances.