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The best size rock for your landscaping depends on the design, as different boulders serve different purposes. If you want to group boulders to create a natural-looking cluster, you’ll need a range of sizes. Otherwise, here are some suggestions:

• Small boulders (smaller than 12 inches across): Best for landscape edging and fire pits 

• Medium boulders (12–24 inches): Best for retaining walls and water features

• Large boulders (more than 24 inches): Best as standalone landscaping features, steps, or walkways.

Of course, you can mix and match sizes to create a unique display.

Rocks are less likely to attract snakes and other critters because their prey (termites, ticks, and other insects) don’t usually inhabit this environment. However, if you have placed together rocks with large spaces in between or near a source of water, you may find a snake or an occasional chipmunk seeking shelter.

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.

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.