The state of California is by far the most important producer of wine in the USA. Its grape growers succeed in many differing environments up and down the state from the fog influenced coastal valleys of Sonoma, Napa and Carneros, to the hot irrigated Central Valley and Monterey, Santa Barbera and Edna Valley on the Pacific coast and to Themecula on the Mexican boarder. California produces a range of varieties such as Cabernet Sauvignon, Chardonnay, Pinot Noir, Zinfandel, Merlot, Syrah.