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The depth of your decomposed granite depends on its intended use, but around 3 to 4 inches is the most common depth. Driveways that need to support a lot of weight should be at a depth of no less than 6 inches. Walkways that won’t see a lot of weight but lots of foot traffic should be built at a depth of 3 to 4 inches, and patios should also be between 3 and 4 inches deep.

A 50-pound bag of pea gravel equals approximately one-half of a cubic foot. That amount will cover a three-square-foot area to a depth of about two inches. A three-square-foot area with equal-length sides is approximately 1.73 feet by 1.73 feet, or about 20.75 inches on each side.

Using sand under stepping stones can be beneficial in certain situations. Sand can help level the ground and provide stability for the stepping stones, especially if the ground is uneven. It also allows for minor adjustments during the installation process. However, sand may not be the best choice for all environments. In areas with high foot traffic or heavy rain, sand may wash away or become displaced, leading to an uneven surface. In such cases, a more stable base material like gravel or crushed stone is preferable. Consider your specific landscape conditions before deciding whether to use sand under stepping stones.

The best mulches for trees are wood chips, bark nuggets, or pine straw. Depending on your goals, you may want to avoid using plastic, stone, rubber, or wet grass clippings. Plastic mulch prevents water from reaching the mulched areas of your tree, stones don’t offer any nutritional benefits to the soil, rubber can release byproducts into the soil when it decomposes, and wet grass clippings can lead to rot. 

Plastic may prove beneficial in cold climates in the winter, but wood chips are the ideal option for most environments.