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Variety of grape mainly used to make wine
the grape variety

Chardonnay (/UK/'/ʃ//ɑːr//d//ə//n//eɪ/, /US/,/ʃ//ɑːr//d//ən/'/eɪ/, ʃaʁdɔnɛ) is a green skinned grape variety used in the production of white wine. The variety originated in the Burgundy wine region of eastern France, but is now grown wherever wine is produced, from England to New Zealand. For new and developing wine regions, growing Chardonnay is seen as a 'rite of passage' and an easy entry into the international wine market. The Chardonnay grape itself is neutral, with many of the flavors commonly associated with the wine being derived from such influences as terroir and oak. It is vinified in many different styles, from the lean, crisply mineral wines of Chablis, France, to New World wines with oak and tropical fruit flavors. In cool climates (such as Chablis and the Carneros AVA of California), Chardonnay wine tends to be medium to light body with noticeable acidity and flavors of green plum, apple, and pear. In warmer locations (such as the Adelaide Hills and Mornington Peninsula in Australia and Gisborne and Marlborough region of New Zealand), the flavors become more citrus, peach, and melon, while in very warm locations (such as the Central Coast AVA of California), more fig and tropical fruit notes such as banana and mango come out. Wines that have gone through malolactic fermentation tend to have softer acidity and fruit flavors with buttery mouthfeel and hazelnut notes. Chardonnay is an important component of many sparkling wines around the world, including Champagne and Franciacorta in Italy. Chardonnay's popularity peaked in the late 1980s, then gave way to a backlash among those wine connoisseurs who saw the grape as a leading negative component of the globalization of wine. Nonetheless, it is one of the most widely planted grape varieties, with worldwide, second only to Airén among white wine grapes and fifth among all wine grapes.

For much of its history, a connection was assumed between Chardonnay and Pinot noir or Pinot blanc. In addition to being found in the same region of France for centuries, ampelographers noted that the leaves of these plants have near identical shape and structure. Pierre Galet disagreed with this assessment, believing that Chardonnay was unrelated to any other major grape variety. Viticulturalists Maynard Amerine and Harold Olmo proposed descent from a wild Vitis vinifera vine that was a step removed from white Muscat. Chardonnay's true origins were further obscured by vineyard owners in Lebanon and Syria, who claimed that the grape's ancestry could be traced to the Middle East, from where it was introduced to Europe by returning Crusaders. Little external evidence supports this theory. Modern DNA fingerprinting research at University of California, Davis, now suggests that Chardonnay is the result of a cross between the Pinot noir and Gouais blanc (Heunisch) grape varieties. The Pinot of the French aristocracy grew in close proximity to the Gouais blanc, giving the two ample opportunity to interbreed. Since the two parents were genetically distant, many of the crosses showed hybrid vigour and were selected for further propagation. These "successful" crosses included Chardonnay and siblings such as Aligoté, Aubin vert, Auxerrois, Bachet noir, Beaunoir, Franc Noir de la Haute Saône, Gamay Blanc Gloriod, Gamay noir, Melon, Knipperlé, Peurion, Roublot, Sacy, and Dameron.

As of 2006, 34 clonal varieties of Chardonnay could be found in vineyards throughout France; most of these were developed at the University of Burgundy in Dijon. The so called "Dijon clones" are bred for their adaptive attributes, with vineyard owners planting the clonal variety best suited to their terroir and which will produce the characteristics that they are seeking in the wine. Examples include the lower yielding clones 'Dijon 76', '95' and '96' that produce more flavor concentrated clusters. 'Dijon 77' and '809' produce more aromatic wines with a "grapey" perfume, while 'Dijon 75', '78', '121', '124', '125' and '277' are more vigorous and higher yielding clones. New World varieties include the 'Mendoza' clone, which produced some of the early California Chardonnays. The 'Mendoza' clone is prone to develop millerandage, also known as "hens and chicks", where the berries develop unevenly.

Chardonnay has a wide ranging reputation for relative ease of cultivation and ability to adapt to different conditions. The grape is very "malleable", in that it reflects and takes on the impression of its terroir and winemaker. It is a highly vigorous vine, with extensive leaf cover which can inhibit the energy and nutrient uptake of its grape clusters. Vineyard managers counteract this with aggressive pruning and canopy management. When Chardonnay vines are planted densely, they are forced to compete for resources and funnel energy into their grape clusters. In certain conditions, the vines can be very high yielding, but the wine produced from such vines suffers a drop in quality if yields go much beyond 80 hl/ha (4.5 tons per acre). Producers of premium Chardonnay limit yields to less than half this amount. While Chardonnay can adapt to almost all vineyard soils, the three it seems to like most are chalk, clay, and limestone, all very prevalent throughout Chardonnay's traditional "homeland". The Grand crus of Chablis are planted on hillsides composed of Kimmeridgian marl, limestone, and chalk. The outlying regions, falling under the more basic "Petit Chablis" appellation, are planted on portlandian limestone which produces wines with less finesse. Chalk beds are found throughout the Champagne region, and the Côte d'Or has many areas composed of limestone and clay. In Burgundy, the amount of limestone to which the Chardonnay vines are exposed also seems to have some effect on the resulting wine. In the Meursault region, the premier cru vineyards planted at Meursault Charmes have topsoil almost above limestone and the resulting wines are very rich and rounded. In the nearby Les Perrières vineyard, the topsoil is only around above the limestone and the wine from that region is much more powerful, minerally, and tight, needing longer in the bottle to develop fully. In other areas, soil type can compensate for lack of ideal climate conditions. In South Africa, for example, regions with stonier, shaley soils and high clay levels tend to produce lower yielding and more Burgundian style wine, despite having a discernibly warmer climate than France. In contrast, South African Chardonnay produced from more sandstone based vineyards tend to be richer and more weighty. This confusion between Pinot blanc and Chardonnay was very pervasive throughout northern Italy, where the two vines grew interspersed in the vineyard and were blended in winemaking. The Italian government did not dispatch researchers to try to distinguish the two vines until 1978. A similar situation occurred in France, with the two vines being commonly confused until the mid 19th century, when ampelographers began combing through the vineyards of Chablis and Burgundy, identifying the true Chardonnay and weeding out the Pinot blanc. Chardonnay was believed to be first planted in Chablis by the Cistercians at Pontigny Abbey in the 12th century. Today, the Chardonnay made in the Chablis region is one of the "purest" expression of the varietal character of the grape due to the simplistic style of winemaking favored in this region. Chablis winemakers want to emphasise the terroir of the calcareous soil and cooler climate that help maintain high acidity. The wines rarely go through malolactic fermentation or are exposed to oak (though its use is increasing). The biting, green apple like acidity is a trademark of Chablis and can be noticeable in the bouquet. The acidity can mellow with age and Chablis are some of the longest living examples of Chardonnay. and in Mexico is found in Baja California(Valle de Guadalupe) and in Coahuila(Valle de Parras) states.

The first successful commercial production of California Chardonnay was from plantings in the Livermore Valley AVA. Wente Vineyards developed a Chardonnay clone that was used to introduce the grape variety in several Californian vineyards throughout the 1940s. In the 1950s, James David Zellerbach, one time US Ambassador to Italy in Rome, started Hanzell Vineyards winery and dedicated it to making Burgundian style Chardonnay. His success encouraged other Californian winemakers to follow suit and culminated in Chateau Montelena's victory over Burgundy Chardonnay in the 1976 blind tasting event conducted by French judges known as the Judgment of Paris. In response, the demand for Californian Chardonnay increased and Californian winemakers rushed to increase plantings. In the 1980s, the popularity of Californian Chardonnay increased so much, the number of vines planted in the state eclipsed that of France by 1988. By 2005, nearly accounted for almost 25% of the world's total Chardonnay plantings. The early trend was to imitate the great Burgundy wines, but this soon gave way to more rich buttery and oaked styles. Frank went on to found Konstantin Frank Vinifera Wine Cellars which helped demonstrate that a winery in the eastern US can produce European style wines as a basis for a winery business. Chardonnay became an important part of that strategy. New York, like Burgundy and Washington, is a cool climate viticultural region. Being cold tolerant, the Chardonnay grape is well suited for New York. Not only can it endure its cold winters, but also buds late, reducing the risk of spring frosts. New York's comparatively cooler growing season causes slower ripening, requiring a longer time on the vine, which allows the grapes to develop greater complexity and character at more reasonable sugar levels than warmer Chardonnay producing regions. New York has subsequently developed significant plantings of the variety since Fournier and Frank's early experiments.

Washington Chardonnays can be very similar to Californian Chardonnays, but tend to have more emphasis on fruit than creaminess. In 2000, it was the most widely planted premium wine grape in the state. Rather than using Dijon clones, Washington vineyards are planted with clones developed at the University of California Davis that are designed to take longer to ripen in the warmer weather of the state's wine regions. This allows winemakers to maintain the acidity levels that balance the fruity and flint earthiness that have characterized Washington Chardonnay. Apple notes are common, and depending on producer and appellation, can range from flavors of 'Golden Delicious' and 'Fuji' to 'Gala' and 'Jonathan'. In Oregon, the introduction of Dijon clones from Burgundy has helped to adapt the grape to the Oregon climate and soils.

Like many grape varieties, Chardonnay first came to Australia in the collection of James Busby in 1832, but it only really took off in the 1950s. It is most significant in South Australia, New South Wales — especially the Hunter Valley and Victoria. One of the first commercially successful Chardonnays was produced by Murray Tyrrell in the Hunter Valley in 1971. Tyrell's vineyard was planted with Chardonnay cuttings that he "borrowed" from Penfolds' experimental plantings by hopping over their barb wire fence one night and pruning their vines. The export driven Australian wine industry was well situated for the Chardonnay boom of the 1980s and 1990s and Australia responded with a unique style of wine that was characterized by big fruit flavors and easy approachability. To compensate for the very warm climate, richness was enhanced by the use of oak chips and acid was added during fermentation. During this period the number of Chardonnay plants increased fivefold and by 1990 it was the most widely planted white wine grape in Australia and third most planted overall behind Shiraz and Cabernet Sauvignon. Early in the 21st century, demand outpaced supply and there was a shortage of Chardonnay grapes which prompted Australian winemakers to introduce new blending partners like Sémillon (known as "SemChard") and Colombard. The wines that do not go through MLF will have more green (unripe) apple like flavors. Oak can be introduced during fermentation or after in the form of the barrel aging. Other winemaking decisions that can have a significant effect include the temperature of fermentation and what time, if any, that the wine allowed to spend aging on the lees. Burgundian winemaking tends to favor extended contact on the lees and even "stirring up" the lees within the wine while it is aging in the barrel in a process known as bâtonnage. Colder fermentation temperatures produce more "tropical" fruit flavors like mango and pineapple. Another reason for the backlash was that Chardonnay was seen as a symbol of the globalization of wine, in which local grape varieties were grubbed up in favor of the big names demanded by international markets. Oz Clarke described a view of Chardonnay as "the ruthless coloniser and destroyer of the world's vineyards and the world's palates." The criticism was centered on the habits of winemakers to pull out or give up on local varieties in order to plant more Chardonnay which offered potentially more income but lack the uniqueness and character of local varieties. Examples of this occurred in south Italy and Spain when ancient Negroamaro, Primitivo, Grenache and Mataro vineyards were ripped up in favor of new Chardonnay plantings.

Currently trials are being run on genetically modified Chardonnay. Trials are underway in the US and South Africa.