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While you don’t need to put anything down before mulch, you can apply a pre-emergent herbicide to prevent weed growth. As long as you remove weeds before you spread mulch, you should be in the clear. But a herbicide is something that you can put down before mulch as an extra layer of protection.

If you don’t have too many fallen leaves, one option is to leave them in place. They’ll eventually decompose, adding vital nutrients to the soil. But if you have a thick layer of leaves smothering your lawn, you’ll want to either mulch them or bag them up for removal. If you choose to collect and bag your leaves, check with your local municipality on any specific guidelines to dispose of them. Many cities offer curbside pickup if the leaves are disposed of in yard waste bags or containers. 

For minor unevenness, you don't necessarily need to remove grass before leveling. You can apply a topdressing mixture to fill in low areas and even out the surface. However, for more significant unevenness or deep depressions, it might be necessary to temporarily remove the grass to ensure proper leveling and soil compaction. After filling and leveling, you can replace the grass or consider reseeding the area.

The growth of tall fescue grass often causes clumps of grass in your lawn. Avoid pulling up the clumps, as it won’t effectively remove them. Instead, dig out clumps and their roots when you notice them early in the growing season. Herbicides can also treat grass clumps, but they can also affect other plants you might not want to kill, so use them sparingly and always follow manufacturer instructions.