Planting drought-tolerant perennials, like daylilies, butterfly plants, and lavender, is a great way to conserve water and to spend less time watering your garden. Once established, drought-tolerant perennial plants can handle some dry spells while still enhancing your landscape and garden with beautiful flowers and foliage. When planning a drought-tolerant garden or landscape, you can choose from a variety of flowering perennials, ornamental grasses and ground covers. Before buying drought-tolerant perennials to grow in your garden, make sure they will grow in your hardiness zone. Other considerations include light requirements, soil requirements, the plant's height and spread at maturity, flowering time, and other qualities, including your own personal preference.