Ornamental sweet potatoes such as 'Marguerite' or 'Blacky' bloom here in College Station, either in the greenhouse or when planted out. The flowers are not flashy, having sometimes fleshy-whitish-or-greyish tones with a darker center. They're small, too, and don't last but a day. Haven't seen any seed balls, but in the greenhouse there may not be any proper pollinators. 'Marguerite' when pulled up in the fall has many large, white tubers left behind. Even though in most winters there is nothing but a few frosty nights (above 25F) no ornamentals seem to last through the winter outside. Real sweet potatoes are perennials in my garden. If you get by without an infestation of mites or aphids, cut pieces of ornamentals can be overwintered on a windowsill in a colored glass bottle with water. Cynthia Mueller College Station TX Zone 8b-9