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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.

Mulch is best used in garden beds and yards, not in your driveway as pothole filler. It is meant to stimulate plant growth. Upon repeated pressure, it turns into compost, which also serves as fertilizer for weeds to take over. The roots will then break into your driveway, leading to more material loss and structural collapses.

If you like the look of mulch in your plant beds, be aware that it can attract a variety of pests, including termites. To avoid wood-to-foundation contact, leave a one-foot barrier around your house and fill it in with rocks or gravel, starting mulch past that barrier and working it outward into your plant beds. 

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.