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Landscape boulders, especially porous stones like sandstone or granite, can crack or break over time. Cracks occur when water seeps into the surface of the stone and freezes. The risk is highest when it rains during the day and temperatures freeze overnight since the moisture has time to penetrate deeper into the rock before expanding.

If you have a steep driveway, angular gravel, which is 3/4 to 2 inches in length, is a great choice. The stones won’t slide, allow for proper drainage, and stay in place even on the steepest slope.

The most important thing to put under a rock garden is the appropriate soil. The specific soil needed will depend on the type of plants you’re growing as well as the environment you live in. You can also put non-woven or woven fabric under the rocks to add to the garden's structural stability.

Yes, weeds can still grow in decomposed granite. If properly compacted, it can act as a good weed suppressant, meaning you’ll only pull weeds occasionally. But no ground cover is completely weed-proof. To further prevent weeds, you can try spraying your decomposed granite with distilled white vinegar.