As home gardeners in the U.S. page through seed catalogs and pick out their favorite heirlooms, there's a new seed that has never been available to them before: a tomato the color of a concord grape ...

This winter as seed catalogs started showing up in gardeners' mailboxes, one stood out. Baker Creek Heirloom Seed Company splashed photos of the purple galaxy tomato on its cover. It bragged, This ...