Folle blanche, also known as Picpoule, Gros Plant, and Enrageat blanc, is a wine grape variety from southwest France. It was the traditional grape variety in Cognac and Armagnac production until the 20th century. Folle blanche is an offspring of Gouais blanc, with the other parent so far unidentified. Folle blanche is used in the Loire Valley area and in Brittany around Nantes to produce , a very dry and often tartly acidic wine that pairs well with shellfish. There it is used both in the production of table wine as well as eau de vie.