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Topsoil should go down first. If the topsoil is next to your house, make sure the grade slopes away from the house to keep water from pooling against your foundation and possibly leaking into your basement or crawl space. Don’t cover your decorative landscape mulch with topsoil as that defeats the purpose of laying down the mulch. If you’re trying to create a certain soil composition to improve plant growth, you’ll likely want compost mixed into the topsoil instead of mulch. Over time, any decorative wood mulch will simply decompose under the topsoil.

Yes, you can put soil on top of existing grass to level small areas. This is helpful for filling in small divots or leveling out minor dips in your yard that collect rainwater. However, this isn’t a good option if you need to regrade your entire lawn. It’s better to have a professional excavate some of the dirt first so that the level of the lawn doesn’t rise too high.

You should add 1 to 4 inches of mulch, depending on your garden type and needs. Keep in mind that no amount of mulch can completely prevent weeds, but a heavier coverage (closer to 4 inches) can suppress weeds enough that you are only seeing them sprout every few weeks. Finer mulch prevents weeds more effectively than large mulch, so if you’re using mulched leaves or shredded bark, 1 to 2 inches will likely suffice, while 3 to 4 inches is best for larger mulch, like bark chips or straw.

The cheapest landscape rock is gravel, pebbles, or decomposed granite. These small rocks are great for affordable driveways and walkways. If you’re looking for larger rocks as a building material, you can get fieldstone affordably, especially if sourced from somewhere in your area.