Pea Gravel is another inexpensive and natural drought-tolerant material. Pea gravel is pea sized stones that are a result of natural weathering found near bodies of water. They are good for covering driveways, paths, and creating transitions in your backyard. Not only can pea gravel save tons of water, it also suppresses weed growth, retains moisture, and doesn’t decompose like organic mulch. When done right, pea gravel can make your backyard more aesthetically pleasing, while keeping it free of mud and weeds.