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You should add 1 to 4 inches of mulch, depending on your garden type and needs. Keep in mind that no amount of mulch can completely prevent weeds, but a heavier coverage (closer to 4 inches) can suppress weeds enough that you are only seeing them sprout every few weeks. Finer mulch prevents weeds more effectively than large mulch, so if you’re using mulched leaves or shredded bark, 1 to 2 inches will likely suffice, while 3 to 4 inches is best for larger mulch, like bark chips or straw.

To prepare your yard for river rocks, smaller rocks may require laying landscape fabric to keep the stones from sinking into the ground while encouraging proper water drainage. You should also clear the land of weeds and larger boulders and, in some cases, test the density of the soil to ensure it can handle the weight.

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.

Since the nature of the landscaping project can heavily influence the overall cost, it helps to understand what different types of landscaping projects cost on average. For example:

• Plant a tree: $100–$2,000

• Build a retaining wall: $3,250–$9,200

• Reseed a lawn: $450–$1,700

• Install a water fountain: $950–$4,800

• Install a paver patio: $2,400–$7,000

• Install a concrete walkway: $1,200–$2,400

• Install a flower bed: $800–$3,000

• Landscape lighting: $2,000–$6,000