The butterfly bush came originally from Asia, and earned its name because its fragrant flowers are a great attraction for butterflies and hummingbirds. A colorful range of cultivars are available, including Martha's favorite, 'Nanho Blue' -- a dwarf variety with pale-blue flowers and silvery-gray leaves.
Buddleias -- commonly referred to as butterfly bushes -- perform best when cut back each year in late winter or early spring, just before they begin to sprout again. Since they are vigorous, fast growers, you can cut them to within 6 to 12 inches from the ground. This may seem drastic, but the result will be healthy, full, stocky bushes.