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Yes, and in many cases, you should. Large gravel works best as a base layer because it improves drainage and keeps the surface stable. A top layer of smaller gravel fills in gaps and creates a smoother, more compacted surface. This combination is common in driveways and high-traffic areas where both stability and comfort matter.

Pea gravel is the most common type of gravel, and it can be made of limestone, granite, basalt, sandstone, and many other types of rock. The strength in gravel comes from the distribution across the stones, so while one rock type may not be particularly strong (like sandstone), the matrix of small rocks that is gravel can become incredibly strong when installed correctly. 

You should exercise care when deciding how to landscape over a leach field for your septic system. You typically want lightweight materials that won’t damage the drain field’s perforated pipes. When adding plants to the area, select plants with shallow roots, such as grass or flower gardens. Trees with deep roots could damage the pipes in the field.

Pea gravel comes in a variety of colors, including cream, white, black, gray, and brown being some of the most popular choices for homeowners. You can also find red, yellow, green, and even multicolor options for your landscaping needs. The price of pea gravel is about $350 for the typical home improvement project.