The red grapes in the Bordeaux vineyard are Merlot (62% by area), Cabernet Sauvignon (25%), Cabernet Franc (12%) and a small amount of Petit Verdot, Malbec and Carménère (1% in total). The white grapes are Sémillon (54% by area), Sauvignon blanc (36%), Muscadelle (7%) and a small amount of Ugni blanc, Colombard and Folle blanche (3% in total). Because of the generally humid Bordeaux climate, a variety of pests can cause a problem for the vigneron. In the past, this was counteracted by the widespread use of pesticides, although the use of natural methods has recently been gaining in popularity. The vines are generally trained in either single or double guyot. Hand-picking is preferred by most of the prestigious châteaux, but machine-harvesting is popular in other places.
Following harvest, the grapes are usually sorted and destemmed before crushing. Crushing was traditionally done by foot, but mechanical crushing is now almost universally used. Chaptalization is permitted, and is fairly common-place. Fermentation then takes place, usually in temperature controlled stainless steel vats. Next the must is pressed and transferred to barriques (in most cases) for a period of ageing (commonly a year). The traditional Bordeaux barrique is an oak barrel with a capacity of 225 litres. At some point between pressing and bottling the wine will be blended. This is an integral part of the Bordeaux winemaking process, as scarcely any Bordeaux wines are varietals; wine from different grape varieties is mixed together, depending on the vintage conditions, so as to produce a wine in the château's preferred style. In addition to mixing wine from different grape varieties, wine from different parts of the vineyard is often aged separately, and then blended into either the main or the second wine (or sold off wholesale) according to the judgment of the winemaker. The wine is then bottled and usually undergoes a further period of ageing before it is released for sale.
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