Establishing a creeping thyme lawn takes a few years but is well worth it when you reap the rewards. Thyme likes hot, dry temperatures, so it never needs watering. Go ahead and sell your mower, because thyme grows only about two inches tall. This hardy herb will be a carpet of blooms in early summer and green the rest of the season. Plus, it smells wonderful when you walk on it. Available at Burpee.com; $3.95.