Syrah African wines. In the United States, wine produced from the grape is normally called by its French name, "Syrah". However, in cases where winemakers choose to follow a New World style, similar to Penfolds Grange, they may choose to label their wines as "Shiraz". Under American wine laws, either name may appear on the label. Syrah first appeared as a wine grape in California in the 1970s, where it was planted by a group of viticulturists who called themselves "Rhône rangers". Although most plantings of the grape are in California, there are increasing amounts of it being grown in Washington
Phenolic content in wine concentration in the skins of wine grapes. The accumulation in ripe berries of different concentrations of both bound and free resveratrols depends on the maturity level and is highly variable according to the genotype. Both red and white wine grape varieties contain resveratrol, but more frequent skin contact and maceration leads to red wines normally having ten times more resveratrol than white wines. Resveratrol produced by grape vines provides defense against microbes, and production can be further artificially stimulated by ultraviolet radiation. Grapevines in cool, damp regions with higher risk of grape diseases, such as Bordeaux and Burgundy, tend to