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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. 

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. 

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.