I found this and thought you would like to to: Columbia Encyclopedia: sweet potato, trailing perennial plant (Ipomoea batatas) of the family Convolvulaceae (morning glory family), native to the New World tropics. Cultivated from ancient times by the Aztecs for its edible tubers, it was introduced into Europe in the 16th cent. and later spread to Asia. My sweet potatoe has a flower just like that:
This doesn't look like a sweet potato plant. Are you sure you did not plant Morning Glory? Sweet Potato plants have fleshy stems and heart shaped leaves, usually bear white, "insignificant" flowers. When I plant them, they usally come from cuttings or "eyes" from the tubers, just like what regular potatoes have. Sweet potato plants come in different colors. Some are reddish, some are purplish and others come in this new variety of chartreuse green which they are now using everywhere for hanging plants.
I keep a vine in my kitchen window all year. I used an over size coffee cup, just make sure to keep the water at least half full. A vine is so pretty in the winter.
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