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A good gravel driveway should be built in layers using different sizes of gravel. A solid base layer of larger crushed stone (around 1 to 6 inches in diameter) provides stability and helps with drainage. Some recommend a middle layer of medium-sized gravel (2 to 3 inches). For the top driving surface, smaller gravel is best. A common recommendation is to use gravel between 1/4 inch and 1 inch in diameter, as it compacts well to create an even surface that's easy to drive on. Avoid stones that are too large, flat, or round to ensure the best traction. Using different layers ensures the driveway is durable, drains properly, and doesn't shift over time.

Stump grindings are usually safe to use in soil, but in some cases, it’s not recommended. Wood chips in particular can bind nitrogen in the soil, which will make it difficult for grass to grow. That’s why it’s important to remove most wood chips and use healthy garden soil if you want to cover the stump spot with grass. Large wood chips may attract beetles and could encourage the growth of fungi when they decay, so you may want to remove them when using the grindings.

Replace organic mulch every one to two years, depending on the variety. Wood chips and straw, for example, will last a couple of years, while grass clippings and pine needles need replacing every several months. Inorganic mulch—such as rock and rubber chips—can stay in place for up to four years, depending on erosion and general garden upkeep. 

It is generally not recommended to put topsoil over new grass seed. A thick layer can suffocate the seedlings by preventing sunlight, water, and oxygen from reaching them. The seeds only need about a quarter-inch of soil for protection. If you want to protect the seeds, a better alternative is to apply a thin layer of organic matter, such as straw mulch or hay.