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When it comes to which stone is better, crushed or natural gravel, it all depends on the project. Crushed stone is a great base and filler material for projects like retention walls, concrete slabs, driveways, pipes, and drains. Gravel is a common choice for visually attractive landscaping projects like walkways, above-ground drainage systems, patios, and garden borders.

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.

If you hire a professional landscaper, you could expect to pay between $90 and $660 to install three cubic yards of river rock. (That’s based on the average river rock installation cost of $30 to $220 per cubic yard.) However, the exact price depends on the kind of river rock you choose. Crushed limestone and riprap are some of the more affordable options, while boulders and Arizona river rock are pricier.

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.