Rocks and boulders can add interest to any landscape, garden or yard. Large boulders are expensive, heavy and difficult to move. Hypertufa boulders, composed of peat moss, perlite and portland cement, are much lighter and less expensive. They are easy to make with a few simple ingredients found at your local building supply store. How to Make Fake Rocks & Boulders | Hunker Please note: You are currently browsing img download landscape boulders landscape channel that is 600x400px in size. This image is listed in landscaping ideas with rocks boulders category. How to Make Fake Rocks Boulders Hunker, 600x400 in 148.74 KB.