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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.

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.

Mature lilac bushes that are large and overgrown are more challenging to remove than small lilac bushes. Large lilac bushes have deeper roots that are more widespread, making it harder to dig them up and remove them. If you don’t dig under and around the primary roots, then you run the risk of the lilac bush growing back. So, it is a time-consuming process if done correctly. 

If you have a lot of trees around your home, mulching all those leaves can smother the lawn. Air and light won't reach the grass and soil if too many leaves have been mulched. Turf grass and other lawn problems can arise if the weather is too wet and excessive leaves have been mulched.