Host Sean Brock shares his passion for archiving and reviving lost crops of the South. Included: hand-querning Jimmy red corn, learning fire threshing and cooking hominy. He also travels to Tennessee's Blackberry Farm, where master gardener John Coyenkdall discusses heirloom seeds; Brock's friend David Shields experiments with seeds at Brock's R&D lab and shares the story of the near-extinct Bradford watermelon; and food scientist Harold McGee talks about combining corn and lye.