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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.

How tall your mulch should be around your tree depends on the type of mulch you use, but aim for 3 to 4 inches as a rule of thumb. You’ll want to avoid simply piling it up in hopes of offering additional benefits to your tree. Volcano mulching is the infamous term for piling way too much mulch against the stem of your tree. This could actually kill your tree or severely harm it, as your tree trunk needs space to breathe without too much moisture.

Sand is a common sublayer for hardscape features like driveways, paver patios, and more. Most projects that involve sand require a 1-inch layer to promote evenness, drainage, and weight distribution. For further drainage, most projects have a 6-inch minimum layer of gravel beneath the sand. 

Mulch costs an average of $15 to $80 per yard, depending on the type you choose and whether you have it delivered and installed by a pro. Generally, it’s cheaper to buy mulch in bulk and have it delivered to your home. However, bags are the more cost-effective choice if you only have a small area to mulch.