Rocks in plant beds define boundaries and create focal points in the garden.

Rock gardens create a hot, dry planting bed suitable for a variety of plants. Rocks in the garden help to add some drainage to the site. Plant beds benefit from some sort of edging material to form a boundary between the bed and walkways, patios or lawns. Edging is especially important if the plant bed has clumping perennials or potentially invasive plants, because it keeps these plants from spreading outside the boundary.