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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.

Generally, you want the soil for your edible plants to have good drainage, organic matter for nutrients, a loose texture (like loam soil), and a balanced pH level. However, the type of plants you're growing will dictate the exact characteristics your soil needs to thrive. For example, brussels sprout prefers more acidic soil, while broccoli prefers more alkaline soil. 

A gravel driveway costs from $1.25 to $1.80 per square foot, including materials and installation. Cost factors for this project include the type of gravel, its thickness, and the amount of site preparation required.

Consider these cost estimates for a 20-foot-long driveway:

• 1-car (240 square feet): $300–$432

• 2-car (480 square feet): $600–$864

• 4-car (960 square feet): $1,200–$1,728

Here are gravel driveways costs for a 50-foot-long driveway:

• 1-car (600 square feet): $750–$1,080

• 2-car (1,200 square feet): $1,500–$2,160

• 4-car (2,400 square feet): $3,000–$4,320

The right depth depends on your intended use for the area. For instance, pea gravel for walkways and patios typically only needs to be about 2 to 3 inches deep. However, driveways and other areas with heavier loads may require 4 to 6 inches for better stability.