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Yes, you can lay pea gravel directly on the dirt. First, dig a trench 2 to 6 inches deep the length and width of the area you want to cover. Plants and weeds will eventually grow through the pea gravel if you don’t lay down landscaping cloth.

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. 

This will depend on the depth of the structure. For a landscape, patio, or walkway that’s around 2 inches deep, a ton of gravel will cover around 100 square feet or about 0.6 cubic yards. However, if you’re building a driveway, which should be a minimum of 12 inches deep, you’d need about 6 tons of gravel to cover the same area.

Regular maintenance involves raking or leveling out any displaced gravel, filling in low spots, and adding fresh gravel as needed to help prevent potholes and ruts. If you live in an area with heavy rain, checking the drainage and reinforcing the edges periodically can help prevent erosion.