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Determining how many boulders you’ll need for your landscaping project depends on the area you need to cover and how big each boulder is. First, you’ll need to determine how big of an area you want covered, then divide that by the base surface area of the boulders. A landscape professional can help you determine how many boulders will be right for your project.

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.

When you purchase mulch for delivery, it’s usually by the cubic yard, so you’ll want to convert your space to cubic yards to get the right amount. First, determine the square footage of the area you want to cover, and then determine how deep the bed of mulch will be—a good rule of thumb is around three inches. Multiply your square footage in feet by the depth in inches and divide by 324. You may want to add a ½ to one additional cubic yard to ensure you have enough.

Under artificial turf, you can lay a subbase, fabric weed barrier, or both. Subbased materials typically include a collection of decomposed limestone and granite or specifically mixed road base. The layer supports water drainage and keeps your artificial turf from sinking and pooling rainwater. If you’re unsure what to put under your artificial turf, call an artificial turf installer near you.