While beautiful animals, deer are a major challenge for many gardeners. These animals can eat plants to the ground and destroy all of your hard work. To keep deer from destroying gardens, many gardeners take several approaches, including fencing and using deer repellents. They also plant deer-resistant perennials that deer tend to avoid because they may not taste good, may smell bad, may have a bad mouth feel or may be toxic to deer. A wide selection of deer-resistant perennials are available for sale, including ornamental grasses, ground covers and flowering plants. When buying deer-resistant perennials for sale, consider their grow zone, light and soil requirements, mature height and spread, and bloom times.