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Mulch is made from natural materials, which will break down and add nutrients to your soil for better plant and soil health, so removing old mulch is unnecessary before putting down new mulch. However, if you live in a particularly moist area, it’s possible that the old mulch will harbor fungus or mold, which can hurt plant health. If you notice these issues, you might want to consider removing the old mulch first. Otherwise, save time and money by placing new mulch right over the old mulch.

Each bag of mulch includes 2 cubic feet of mulch. And since a cubic yard is about 27 cubic feet of materials, you'll need 14 bags of mulch to have enough to cover a cubic yard. The right amount of mulch for your yard, however, depends on the depth of the mulch, the type of mulch you choose, and your desired look.

The right depth depends on your intended use for the area. For instance, pea gravel for walkways and patios typically only needs to be about 2 to 3 inches deep. However, driveways and other areas with heavier loads may require 4 to 6 inches for better stability.

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.