Growing drought-tolerant perennial plants is a great way to conserve water or reduce the amount of time you spend watering your garden. Once they establish their roots, drought-tolerant perennials can handle some dry spells. Direct Gardening offers a wide selection of drought-tolerant perennials that are ideal for water-wise gardens. A few favorites include ornamental grasses, sedum, hummingbird mint, coreopsis and daylilies. When planning a drought-tolerant garden, select a variety of plants with different bloom times. This helps keep your garden looking fresh and in bloom throughout the growing season. Other factors to consider when buying drought-tolerant perennials for sale online are their mature height and spread, hardiness zone and sunlight requirements.