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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.

Several tools exist that can help remove unwanted grass. The one you choose depends greatly on how much you need to remove and how hard you'd like to work. A sod or turf cutter is the fastest method while using a shovel is labor-intensive and much slower. You may also need a garden rake, tiller, and wheelbarrow. 

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 most common alternative is burning the stump first, then dealing with the cinders and ashes. As you can imagine, this option creates fire hazards, especially since roots can burn underground, hidden, for long afterward. That’s why many states and cities have outlawed the use of stump burning entirely. We do not recommend this option as a viable alternative unless you get a permit from the local fire department and practice all safe burning procedures.

Others prefer a more long-term DIY approach of degrading the stump with home mixtures like Epsom salt and vinegar injected directly into it. This may help the stump decay faster, allowing homeowners to dig it out themselves, but it’s still a lengthy process. It usually takes months for a stump to start falling apart with such treatments, and in the meantime, it can be vulnerable to rot, insects, and other problems.