Sauvignon Blanc - Viticulture

Viticulture

Winemakers in New Zealand and Chile harvest the grapes at various intervals for the different blending characteristics that the grape can impart depending on its ripeness levels. At its most unripe stage, the grape is high in malic acid. As it progresses further towards ripeness the grape develops red & green pepper flavors and eventually achieves a balance of sugars. The flavors characteristic of Sauvignon Blanc come from the chemicals methoxypyrazines. Grapes grown in Marlborough's Wairau Valley may exhibit different levels of ripeness over the vineyard, caused by slight unevenness in the land and giving a similar flavor profile to the resulting wine.

Sauvignon Blanc can be greatly influenced by decisions in the winemaking process. One decision is the amount of contact that the must has with the skins of the grape. In the early years of the New Zealand wine industry, there were no wineries on the South Island which meant that freshly harvested grapes had to be trucked and then ferried to the North Island, often all the way up to Auckland. This allowed for prolonged exposure of the skins and juice which sharpened the intensity and pungency of the wine. Some winemakers, like the Loire, intentionally leave a small amount of must to spend some time in contact with the skin for later blending purposes. Other winemakers, like in California, generally avoid any contact with the skin due to the reduced aging ability of the resulting wine.

Another important decision is the temperature of fermentation. French winemakers prefer warmer fermentations (around 16-18 °C) that bring out the mineral flavors in the wine while New World winemakers prefer slightly colder temperatures to bring out more fruit and tropical flavors. A small minority of Loire winemakers will put the wine through malolactic fermentation, a practice more often associated with New Zealand wines. Oak aging can have a pronounced effect on the wine, with the oak rounding out the flavors and softening the naturally high acidity of the grape. Some winemakers, like those in New Zealand and Sancerre, prefer stainless steel fermentation tanks over barrels with the intention of maintaining the sharp focus and flavor intensity.