Clos du Bois is in Geyserville. It was founded in the early 1970s by businessman Frank Woods and a group of investors who purchased vineyards. The debut commercial wines were the 1974 Chardonnay and Pinot Noir and in 1988 the estate was acquired by Wine Alliance, a subsidiary of Hiram Walker. Today Clos du Bois is owned by Constellation Brands, the world’s largest wine, beer and spirits conglomerate. Clos du Bois owns 800 acres in several appellations and makes a large portfolio of wines.
Alexander Valley is an American Viticultural Area just north of Healdsburg, in Sonoma County. It was granted AVA status in 1984, with amendments made in subsequent years. The Russian River flows through the valley, and the region was named for Cyrus Alexander, a 19th century landowner and grape grower. The AVA includes 15,000 vineyard acres, much of it rich, alluvial soil layered on a bed of gravel, somewhat similar to many vineyards in Bordeaux. Alexander Valley is sheltered from marine weather by the low hills northeast of Healdsburg, though it is often shrouded in the morning fog coming off the Russian River. Some of the earliest commercial winemaking in the area started in the 1880s, when immigrants formed the Italian Swiss Colony cooperative at Asti. The region made jug wines until the 1960s and 1970s, when a new wave of quality-minded producers started estates. Today Alexander Valley is home to some of California’s most admired wineries, including Simi, Stonestreet and the Francis Ford Coppola Winery. Silver Oak Cellars, though based in Napa Valley, has a second winery in Alexander Valley where it makes Alexander Valley Cabernet Sauvignon. Many grapes do well in the Alexander Valley, including Cabernet Sauvignon, Chardonnay, Merlot, Riesling, Sauvignon Blanc and Zinfandel.