The best of the new! Jamie Durie takes viewers to Cornerstone Gardens—one of North America's premiere collections of exciting new garden design. Cornerstone presents gardeners with some terrific, fresh ideas to bring home to their own spaces. Ever wonder how new plants make it onto nursery shelves? Paul Epsom explores the path from seed to retail sale when he visits an All-American Selection trial garden. This week's "Homegrown" features a husband-and-wife team that bring the farm to the table: Chef Ana Sortun and farmer Chris Kurth show Michel Nischan the glories of freshly-dug potatoes.