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Yes, it's perfectly safe and environmentally sound to mulch leaves with a lawn mower, provided that the layer of leaves isn't too thick and the leaves are dry and crispy. Too many wet leaves get sticky and will clog the mower. Thick layers of leaves can suffocate the lawn after the leaves have been mulched, so the layer should be no more than six inches thick.

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.

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.

Weeds may grow back when pulled out if the root is not completely removed. Invasive weeds can regrow from just a small portion of remaining root, so using a weed-pulling tool can help ensure you remove the entire root. Weeds may grow back faster if roots aren’t fully removed, and incomplete removal could cause them to spread as well.