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Among the most common types of gravel are pea gravel, crushed stone, marble chips, jersey shore gravel, and base gravel. Gravel has different densities depending on whether it’s wet or dry or mixed with sand.

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. 

When it comes to which stone is better, crushed or natural gravel, it all depends on the project. Crushed stone is a great base and filler material for projects like retention walls, concrete slabs, driveways, pipes, and drains. Gravel is a common choice for visually attractive landscaping projects like walkways, above-ground drainage systems, patios, and garden borders.

When you purchase mulch for delivery, it’s usually by the cubic yard, so you’ll want to convert your space to cubic yards to get the right amount. First, determine the square footage of the area you want to cover, and then determine how deep the bed of mulch will be—a good rule of thumb is around three inches. Multiply your square footage in feet by the depth in inches and divide by 324. You may want to add a ½ to one additional cubic yard to ensure you have enough.