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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.

Yes, it is possible to add too little mulch. Anything less than 1 inch will likely result in too little coverage around your plants, allowing weeds to grow through and minimizing the positive effects that a deeper bed of mulch would have, like maintaining proper soil moisture and insulating the ground.

Measure the area needing coverage and consult with suppliers on average depth requirements for each material. Calculations often use cubic yards for accuracy and practicality.

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.