Chenin blanc (, ; known also as Pineau de la Loire among other names) is a white wine grape variety from the Loire Valley of France. Its high acidity means it can be used to make varieties from sparkling wines to well-balanced dessert wines, although it can produce very bland, neutral wines if the vine's natural vigor is not controlled. Outside the Loire, it is found in most of the New World wine regions; it is the most widely planted variety in South Africa, where it was historically also known as Steen ( ). The grape may have been one of the first to be grown in South Africa by Jan van Riebeeck in 1655, or it may have come to that country with Huguenots fleeing France after the revocation of the Edict of Nantes in 1685. Chenin blanc was often misidentified in Australia, as well, so tracing its early history in the country is not easy. It may have been introduced in James Busby's collection of 1832, but C. Waterhouse was growing Steen at Highercombe in Houghton, South Australia, by 1862.
It provides a fairly neutral palate for the expression of terroir, vintage variation, and the winemaker's treatment. In cool areas, the juice is sweet but high in acid with a full-bodied, fruity palate. In the unreliable summers of northern France, the acidity of under-ripened grapes was often masked with chaptalization with unsatisfactory results, whereas now, the less-ripened grapes are made into popular sparkling wines such as Crémant de Loire. The white wines of the Anjou AOC are a popular expression of Chenin as a dry wine, with flavors of quince and apples. In nearby Vouvray AOC, vintners aim for an off-dry style, developing honey and floral characteristics with age. In the best vintages, the grapes can be left on the vines to develop noble rot, producing an intense, viscous dessert wine, which may improve considerably with age.
History
left|thumb|The works of French writer François Rabelais indicate that Chenin blanc was a major grape in the Loire Valley by the 16th century.
French ampelographer Pierre Galet has theorized that Chenin blanc originated in the Anjou wine region sometime in the 9th century, and from there traveled to Touraine by at least the 15th century.
When Thomas Bohier purchased vineyard land around Chenonceaux on January 3, 1496, several grape varieties were brought in from the Burgundy wine region of Beaune, the Jura wine region of Arbois and nearby Orléans and Anjou. One of these varieties, a white grape known as Plant d'Anjou, was later planted between 1520 and 1535 at a nearby site known as Mont Chenin in Touraine by the Lord of Château de Chenonceau and his brother-in-law, Denis Briçonnet, the abbot of Cormery. Ampelographers believe that Plant d'Anjou was like Chenin blanc, with the grape eventually taking on the name from Mont Chenin.</blockquote>
From France, the grape spread to South Africa, where it was most likely included among the vine cuttings sent to Jan van Riebeeck in the Cape Colony by the Dutch East India Company. In the 20th century, a subvariety of Chenin planted in the Loire was found to be not actually Chenin blanc at all, but rather the Portuguese grape Verdelho, which is banned from French AOC regulations in the Loire.
The climate of a wine region largely dictates whether Chenin blanc is produced in a predominantly sweet or dry manner, while the vineyard soil type generally influences the overall style of the wine.
Yields and harvest times
left|thumb|Producers often harvest Chenin blanc by hand in a succession of pickings known as "tries". The grapes may be harvested as whole clusters or individual berries.
While true for most wine grape varieties, the quality of Chenin blanc wine is intimately connected to the care taken in the vineyard. If the grapes are harvested too soon, before they ripen, the high acidity results in wine being (according to wine expert Oz Clarke) "one of the nastiest wines possible". If the grapes are harvested at too high of a yield, the grapes do not retain any of Chenin blanc's distinctive character notes.
In the 1970s, plantings of Chenin blanc in the Loire were uprooted in favor of the more fashionable red Cabernet Franc and white Sauvignon blanc, as well as the easier-to-grow Gamay. In 2012, Washington had of Chenin while Texas was growing .