Dusty Miller, with its lacy, silvery white leaves, makes a wonderful companion to many plants in the garden. Once established, it requires little care, and will happily tolerate heat and drought. It can just as easily create a beautiful border around taller plants like salvia, or provide a lush backdrop for shorter plants like ageratum. It is considered an annual, but has been known to come back year after year in warmer climates (typically zones 8 and higher). Available on burpee.com; $3.95 for 100 seeds.