Ideas for landscaping with river rock include combining the rocks with plants to create a lovely accent. River rocks come in many interesting colors and patterns, which enhance gardens and landscapes. Use river rocks to define the space along a perennial flower bed, or in place of mulch to help plants retain water. Ideas for Landscaping With River Rock | Garden Guides Please note: You are currently browsing img download river rock landscaping ideas landscape channel that is 1280x720px in size. This image is listed in river rock landscaping ideas category. Ideas for Landscaping With River Rock Garden Guides, 1280x720 in 168.47 KB.