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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.

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. 

Always remove leaves from hardscapes and other lawn features. Leaves and other yard debris can become slippery and dangerous, and fallen leaves can discolor and stain materials like stone, brick, and concrete. Use a rake, brush, or leaf blower to remove leaves from hardscapes and prevent staining.

In most cases, it’s better to remove rocks before adding mulch. Layering the two will restrict drainage and plant health, and can create an unpleasant texture underfoot.