Sandstone and limestone tend to be the least expensive ... In fact, flat boulders make good steps. These large landscape rocks are sometimes used to build retaining walls or tiered yards because ...

ISLA: Wow, that means that limestone used to be under the sea! CONNOR: Limestone has natural cracks in it, but they are much thinner to begin with. They get wider because limestone can be ...

Limestone, made from calcium carbonate, takes millions of years to form. These sedimentary rocks are born ... that would convince you to use them in your own DIY landscaping projects?