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While leaves won’t fully decompose over winter, they will still continue to decompose, just more slowly than usual.

The time it takes for leaves to decompose can range from six months to three years. Key factors influencing the decomposition rate include water, sunlight, and heat, so local weather conditions play a significant role. Decomposition will take longer for thick, matted layers of leaves. To speed up the process, you can mulch the leaves, as smaller pieces break down faster. Spreading large piles into thinner layers to increase exposure to sunlight and water also helps accelerate decomposition.

It’s possible to over-mulch leaves. If the leaf mulch is thick enough that it’s blocking and smothering the grass, that’s a problem. Ideally, you should still be able to see the grass when you’re done mulching to ensure its ability to continue growing. The solution is to make another pass at the top layer of leaf mulch to collect some of the top layer.

If you have a large area of brush and vegetation to clear, forestry mulching may be the best option. This method works well for relatively flat areas that don’t have many large rocks or mature trees to clear. Forestry mulching is a relatively quick process that improves soil health, reduces fire risk, and leaves behind usable mulch.