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The ideal amount of mulch is the square footage of your desired depth in inches divided by 324. Aim to keep your old and/or new mulch at a depth of no more than three or four inches.

The cost of 200 square feet of pea gravel depends on how deep your installation will be. The pea gravel material alone costs between $15 and $75 per cubic yard. You'll need just under two yards to cover 200 square feet to a depth of three inches, for a total cost of between $30 and $150.

Pea gravel comes in a variety of colors, including cream, white, black, gray, and brown being some of the most popular choices for homeowners. You can also find red, yellow, green, and even multicolor options for your landscaping needs. The price of pea gravel is about $350 for the typical home improvement project.

You should exercise care when deciding how to landscape over a leach field for your septic system. You typically want lightweight materials that won’t damage the drain field’s perforated pipes. When adding plants to the area, select plants with shallow roots, such as grass or flower gardens. Trees with deep roots could damage the pipes in the field.