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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.

While you don’t need to put anything down before mulch, you can apply a pre-emergent herbicide to prevent weed growth. As long as you remove weeds before you spread mulch, you should be in the clear. But a herbicide is something that you can put down before mulch as an extra layer of protection.

No. Unfortunately, leaf removal is your responsibility, no matter what tree the leaves come from. It would be pretty hard to regulate leaves since they can be moved by the wind or water. Imagine the detective skills it would take to determine which tree each leaf came from and who was then liable for removing it. Instead, plan to remove any leaves on your property.

If you don’t have too many fallen leaves, one option is to leave them in place. They’ll eventually decompose, adding vital nutrients to the soil. But if you have a thick layer of leaves smothering your lawn, you’ll want to either mulch them or bag them up for removal. If you choose to collect and bag your leaves, check with your local municipality on any specific guidelines to dispose of them. Many cities offer curbside pickup if the leaves are disposed of in yard waste bags or containers.