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Determining how many boulders you’ll need for your landscaping project depends on the area you need to cover and how big each boulder is. First, you’ll need to determine how big of an area you want covered, then divide that by the base surface area of the boulders. A landscape professional can help you determine how many boulders will be right for your project.

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.

Under artificial turf, you can lay a subbase, fabric weed barrier, or both. Subbased materials typically include a collection of decomposed limestone and granite or specifically mixed road base. The layer supports water drainage and keeps your artificial turf from sinking and pooling rainwater. If you’re unsure what to put under your artificial turf, call an artificial turf installer near you.

The best size rock for your landscaping depends on the design, as different boulders serve different purposes. If you want to group boulders to create a natural-looking cluster, you’ll need a range of sizes. Otherwise, here are some suggestions:

• Small boulders (smaller than 12 inches across): Best for landscape edging and fire pits 

• Medium boulders (12–24 inches): Best for retaining walls and water features

• Large boulders (more than 24 inches): Best as standalone landscaping features, steps, or walkways.

Of course, you can mix and match sizes to create a unique display.