 Well, if you love a thick green lawn but would like to get that lawn without wasting a ton of water, when, where, and how much you water can mean the difference between a lush lawn and, unfortunately, an empty wallet. Yeah, but cutting those watering costs without giving up the green lawns we love is actually pretty easy, and it doesn't require that many steps. First of all, you want to make sure that you're watering your lawn early in the day, and that's going to prevent evaporation.