Abundant blooms and ease of care make vinca (Catharanthus roseus) an excellent selection if you have little time to tend your garden. Useful in borders, flowerbeds, rock gardens and containers, the vinca flower provides instant color wherever it grows. The round, flat blooms appear on top of 12- to 15-inch stems. These drought-tolerant bedding plants thrive in any soil type as long as it is fast draining and not overly fertile. Hardy in U.S. Department of Agriculture plant hardiness zones 9b through 11, vincas thrive in full sun.