I have a great crop of these heirloom Chioggia beets this summer. According to Seed Savers Exchange, an heirloom seed company you may visit at
http://www.seedsavers.org/ to purchase seeds, Chioggia beets are a pre-1840 Italian heirloom, introduced to the U.S. before 1865. They are named for a fishing town near Venice. I planted the seeds in my South Carolina garden on February 18, after most of the freezing weather had passed, and I began harvesting them on May 9.