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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.

The best time to lay mulch depends on the type of mulch and the reason for installing it: 

• Summer: Adding extra mulch helps soil retain moisture and keeps weeds at bay, allowing plants to thrive. 

• Fall: Adding mulch helps control weeds and keeps soil and roots warm during the cooler months. Aim to add a layer of mulch 2 to 4 inches deep.

• Winter: Mulch around perennial plants to help keep them insulated.

• Spring: Wait until the ground has thawed. Depending on the thickness, add between 1 and 4 inches of mulch to provide freeze and rain protection and enrich the soil.

A yard of crushed concrete costs between $20 and $50. A single-car driveway will need 1.5 to 2.5 yards of crushed concrete, putting your material costs between $30 and $125, which is much less than you’ll pay for most driveway paving methods. Your total could vary based on the thickness you’re going for, and, of course, total prices will increase with added square footage for driveways that fit multiple cars.