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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.

If you like the look of mulch in your plant beds, be aware that it can attract a variety of pests, including termites. To avoid wood-to-foundation contact, leave a one-foot barrier around your house and fill it in with rocks or gravel, starting mulch past that barrier and working it outward into your plant beds. 

Many ways to landscape a steep slope on a budget exist. Avoiding expensive retaining wall construction is the first step. Consider creating a rocky slope with boulders or large stones, or think about planting perennials that return every year with a single investment. Transplanting small trees from elsewhere on your property is also possible and can help to stabilize steep slopes without purchasing new ones. 

Weeds can grow through rubber mulch, but it depends on if you removed all the weeds in your garden beforehand. Weeds already in the soil can grow even when using rubber mulch. However, that doesn’t mean that your garden will be littered with rubber and weeds, but it does mean that the occasional weed might still pop up. Another way you can increase your weed suppression is by using landscape fabric as a second layer.