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.
In Cognac, the cultivation of Folle blanche is increasing again among enthusiastic wine farmers, but from a very low level.
In Armagnac it has been mostly replaced by its hybrid offspring Baco blanc due to phylloxera damage. Baco blanc (also known as Baco 22 A) is a cross of Folle blanche and the Vitis riparia × Vitis labrusca hybrid Noah. Folle blanche is also the parent of the very hardy and disease-resistant Baco 1 (or Baco noir), a cross of Folle blanche and a Vitis riparia variety. Baco noir and Baco 22 A, like Folle blanche and their other parents, produce a very acid wine. This makes them more suited to distillation than less acidic grapes.
Folle blanche is used in the Loire Valley area and in Brittany around Nantes to produce Gros Plant du Pays Nantais, 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.
History
left|thumb|Gouais blanc, one of the parent varieties of Folle blanche.
The first recorded mentioning of Folle blanche was in 1696 when the grape was documented as one of the varieties growing in the Charente-Maritime department. Here the grape has had a long history being used in the production of Cognac and Armagnac. The name Folle is a feminine derivative of the French word fou which means "mad" with ampelographers speculating that this could be a reference to the grapevine's tendency to being highly productive and grow vigorously where ever it is planted. Several of Folle blanche's synonyms also seems to make similar allusions such as Gros Plant ("big vine") which was first used for the grape in 1732 in the Loire-Atlantique department and Enrageat (from the French enragé) that has been a common synonym for Folle blanche in Southwest France since at least 1736.
DNA analysis in the late 20th and early 21st century has concluded that Folle blanche is likely one of the numerous offspring vines of Gouais blanc, though the second parent is currently unknown. In 2001, French ampelographer Guy Lavignac theorized that Folle blanche likely originated in either the Landes or Gers departments of Southwest France due to the proliferation of offspring and sibling varieties of Folle blanche in those regions.