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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.

To remove old grass effectively, you typically need to dig to one to two inches. This depth typically allows you to reach the root system of the grass, ensuring thorough removal. However, if the grass is a particularly dense or deep-rooted variety (such as Bermuda grass), or if you're planning to replace it with a different landscaping feature, you may need to dig deeper to loosen the soil and remove any underlying roots.

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.

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.