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Variety of grape

Sémillon is a golden skinned grape used to make dry and sweet white wines, mostly in France and Australia. Its thin skin and susceptibility to botrytis make it dominate the sweet wine region Sauternes AOC and Barsac AOC.

The Sémillon grape is native to the Bordeaux region. It was known as Sémillon de Saint Émilion in 1736, while Sémillon also resembles the local pronunciation of the town's name ([semi'ʎuŋ]). It first arrived in Australia in the early 19th century and by the 1820s the grape covered over 90% of South Africa's vineyards, where it was known as Wyndruif, meaning "wine grape". It is fairly resistant to disease, except for rot. The grape ripens early, when, in warmer climates, it acquires a pinkish hue. Since the grape has a thin skin, there is also a risk of sunburn in hotter climates; it is best suited to areas with sunny days and cool nights. Sémillon wines are rather heavy, with low acidity and an almost oily texture. It has a high yield and wines based on it can age a long time. Along with Sauvignon blanc and Muscadelle, Sémillon is one of only three approved white wine varieties in the Bordeaux region. The grape is also key to the production of sweet wines such as Sauternes. For the grapes to be used for sweet wine production, they need to have been affected by Botrytis (also known as "noble rot"). This fungus dries out the grapes, thus concentrating the sugar and flavours in the grape berry.

Sémillon is an important cultivar in two significant wine producing countries. In France, Sémillon is the preeminent white grape in the Bordeaux wine regions. The grape has also found a home in Australia; whereas today the country's major white varieties are Chardonnay and Sauvignon blanc, early in the country's viticultural development it was Sémillon, at that time mislabeled as Riesling, that was the most significant white variety.

In France, the Sémillon grape is grown mostly in Bordeaux where it is blended with Sauvignon blanc and Muscadelle. When dry, it is referred to as Bordeaux blanc and is permitted to be made in the appellations of Pessac Léognan, Graves, Entre Deux Mers and other less renowned regions. In this form, Sémillon is generally a minor constituent in the blend. However, when used to make the sweet white wines of Bordeaux (such as those from Sauternes, Barsac and Cérons) it is often the dominant variety. In such wines the vine is exposed to the "noble rot" of Botrytis cinerea which consumes the water content of the fruit, concentrating the sugar present in its pulp. When attacked by Botrytis cinerea, the grapes shrivel and the acid and sugar levels are intensified. Due to the declining popularity of the grape variety, fewer clones are cultivated in nurseries causing producers to project a future shortage of quality wine. In 2008, 17 Bordeaux wine producers, including Château d'Yquem, Château Olivier, Château Suduiraut and Château La Tour Blanche, formed an association to grow their own clones.

Semillon is one of the Cape's true heritage white varietals, with origins as early as the 17th century (when it became known as Groendruif which translates as Green grape), the grape variety accounted for more than 90% of plantings in the first half of the 19th century. While South African Semillon has not quite taken off as a serious commercial category in single varietal form in the modern era, there are stunning wines being made from especially older vineyards (some of them centurions). More often, the variety plays a role in beefing up the volume of Sauvignon blancs. The best South African Semillons have juicy fruit with often an ethereal like citrus perfume, fine texture, herbal interest and manage to marry the intensity of flavour with finesse. A red mutation of Semillon is today rarely found, although it was once quite common in South Africa. Semillon Rouge is also a synonym for Merlot.

Outside of these regions, however, Sémillon is unpopular and often criticised for lack of complexity and intensity. As such, plantings have decreased over the last century. As referenced above, the grape can still be found in South Africa and Chile. The latter is reputed to have the largest plantings of this grape, although the number of acres planted with Sémillon fluctuates often. California growers plant Sémillon primarily to blend it with Sauvignon blanc. There are some wineries in the Washington State that have produced Sémillon as a varietal wine since the early 1980s; others actively produce Sémillon for Ice Wine and Late Harvest wines. At least one winery in Idaho grows and produces a varietal offering and at least four vineyards in Texas are growing Sémillon. The grape is also planted in Argentina, Canada (Niagara and British Columbia) and recently in New Zealand.