One of our neighbors gave us a couple of long planters with these flowers several years ago. I've no idea what they are, but they come back year after year. She advised us to take them inside to a dark place over winter and bring them back outside in the spring after the frosts have passed. Sure enough, they come back to life and bloom again!
(As usual, click on the image to make it bigger!)
Let me know if you recognize these blooms! I'd love to know what they are!