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As a base, you should use a fertilizer with a 5-5-5 NPK ratio (5% nitrogen, 5% phosphorus, and 5% potassium). You may need a different ratio depending on what your soil is lacking, but a soil test can help determine the perfect amount.

If you hire a professional landscaper, you could expect to pay between $90 and $660 to install three cubic yards of river rock. (That’s based on the average river rock installation cost of $30 to $220 per cubic yard.) However, the exact price depends on the kind of river rock you choose. Crushed limestone and riprap are some of the more affordable options, while boulders and Arizona river rock are pricier.

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.

If you are xeriscaping a lawn from scratch, your best bet for preparing the lawn is to work with a xeriscaping specialist in your area. The most common first step to making the transformation, however, will be to remove the turfgrass from your lawn. The subsequent steps will often include amending the soil to support new plants and installing low-drip or drip irrigation systems.