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If you’re using crushed stone or gravel as a base material, then yes, you should compact it to prevent movement of the top layers. For instance, if you don’t compact crushed stone or gravel and you lay pavers on top of them, the pavers will shift over time. However, if you’re using gravel or crushed stone as a top layer for aesthetic purposes, you might not want to compact the materials.

Sand is a common sublayer for hardscape features like driveways, paver patios, and more. Most projects that involve sand require a 1-inch layer to promote evenness, drainage, and weight distribution. For further drainage, most projects have a 6-inch minimum layer of gravel beneath the sand. 

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. 

No, gravel and crushed rock are different. Crushed rock is made in a quarry and has sharp, jagged edges. It’s most commonly used for building and construction.

Gravel naturally occurs in river beds or lakes and features smooth edges, making it a better choice for landscaping or other decorative areas. Like crushed stone, gravel can also be found in quarries, but it’s typically due to rock-on-rock erosion rather than machinery.