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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.

If composting feels too complicated, mulching is an effective alternative. While composting focuses on breaking down yard waste to feed the soil, mulching uses that same organic material as a protective top layer. It's a quick way to get value from leaves, grass clippings, and other yard debris without the time or effort composting requires.

You can leave grass clippings on the lawn, depending on their length. You don’t want to completely cover new grass and block it from sunlight, or encourage moss crowd out the more delicate grass. However, short clippings are usually fine to leave on the lawn. In some cases, they can be beneficial: Clippings can be a source of fertilizer and help protect the ground as young grass blades develop.

It typically takes six to 12 months for leaves to decompose entirely. The process involves the mulch composting into your lawn to deliver nutrients that facilitate grass growth. The recommended process is to spread a thick layer of leaf mulch over your garden and let it marinate for a few seasons for best long-term results.