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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.

When it rains, decomposed granite can become muddy and mushy in texture and start to wash away, leading to erosion of the surface. Decomposed granite’s inability to endure heavy rainfall is one of its biggest drawbacks.

When laying gravel, it's often a good idea to apply a base layer, such as sand or crushed concrete. You may also want to layer a weed-blocking membrane on top of the base layer to prevent weeds and grass from sprouting up in your gravel driveway. Without the appropriate base layer, the gravel you lay may sink into the soil.

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.