Do you dream of a field of delicate, beautiful butterflies? Butterflies that won't fly away? Well, I have the answer for you!
Try growing Gaura Lindheimeri.
Its beautiful bloom looks much like a butterfly. And since the bloom rests upon thin, long strands of foliage, the wind seems to fling these winged blooms into flight. No wonder the common name is Butterfly Gaura, and that there are cultivars named 'Whirling Butterflies', 'Sunny Butterflies', 'Crimson Butterflies', and 'Blushing Butterflies'!
Gaura will grow in zones 6 through 9 (possibly 5), likes full sun, and will spread to around 3 ft. It can grow to around 5 ft tall if staked, or flop upon itself if not staked. I don't stake mine, and it cascades into a cloud of blooms. Gaura blooms in late spring, then again early autumn. It can be cut back in midsummer if you like a bushier look.
My field of dreams would be a field full of butterfly gaura. I think if I built it, the real butterflies would come.