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While they’re popular and have a lot of pros, the cons of river rocks include the following:

• River rocks don’t break down or provide nutrients to plants. 

• These stones can get hot and scorch nearby plants. 

• River stones may heat the surrounding soil to inhospitable temperatures. 

• Rocks can block rainwater from seeping into the ground if installations are too thick or tightly packed.

Most downsides occur when using river rock as mulch in gardens and flower beds. However, you can still incorporate river rocks into your landscape as long as you use them in the correct ways.

How much 4 yards of dirt will cover depends on how deep you want the soil to be. In general, a yard of dirt will cover 324 square feet for a 1-inch depth or 100 square feet for a 3-inch depth. Therefore, you can expect 4 yards to cover between 400 and 1,296 square feet if you keep your soil depth between 1 and 3 inches.

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