28.2% were 65 years or older. Industry January 2012 - Feld Entertainment purchased the Palmetto Corporate Center, a former Siemens Corp. complex here and plans to move most of its various operations and its world headquarters there over a five-year period starting with its worldwide production center. 1900 - Fuller's Earth Plant mined clay to be used as bleaching agent and as an absorbent for oil and fat. 1850s to present - Agriculture was an important industry, starting with sugarcane from Gamble Plantation. This was harvested through slave labor up until the Civil War. Vegetable farms and citrus groves are also important industries in Ellenton. References Census-designated places in Manatee County, Florida Sarasota metropolitan area Census-designated places in Florida Former municipalities in Florida