This is my sweet potato vine, after I had already cut it back. It was taking over the deck. You can find sweet potato vine in different colors, from this bright chartreuse to almost a purple black. It loves the sun and even if you forget to water it and the leaves start wilting, it will bounce back quickly after a good soaking. Sweet potato vine is an annual so I plant it new every year. After the season is over and you do your garden clean up, you'll find the actual sweet potato (probably more than one) under the soil. I still haven't tried eating them, I've always thought these were ornamental as opposed to edible. Here's my post on that topic a couple of years ago.
Bookshelf: Container Gardening Books