This is sold as a bulb, not a plant.  Colocasia esculenta, commonly called taro, is a tuberous, stemless, frost-tender perennial of the arum family (see also calla lily and jack-in-the-pulpit) which typically grows 3-6' tall and as wide. For gardeners, it is primarily grown as a foliage plant with huge, heart-shaped to arrowhead-shaped, conspicuously-veined, downward-pointing, peltate leaves (to 2' long) on long, stout, succulent stems. As the common name suggests, each leaf purportedly resembles an elephant's ear. Calla lily-like flowers with yellowish-white spathes and spadixes are infrequently produced and usually hidden by the foliage when they do occur.