Another option for stones as lawn edging is to use large field stones. With this type of rock, you can source material locally and, depending on where you live, from natural areas. If you’re building a home or excavating a site on your property, save rocks you unearth to use as possible edging. When using rocks as edging, fit stones as closely together as you can to limit weed and grass growth. Use a product like Preen between and behind rocks to help prevent weed seeds from sprouting.