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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.

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.

No, it’s not necessary to remove all the leaves from your lawn—in fact, leaving some behind can be beneficial. While it's important to clear thick layers of leaves that can smother your grass, leaving a light scattering of leaves can help feed your soil while also providing safe winter habitat for pollinators like bumble bees. Leftover leaves will eventually break down, enriching the soil and promoting healthy lawn growth.

If debris from a tree located in a government-owned space (such as a sidewalk, public school, or government property) falls in your yard, it is the city’s or state government’s responsibility to have the debris cleaned up. On the other hand, most states only hold a neighbor liable for cleaning up their tree’s debris if they were negligent in caring for the tree.