In the late 1940s and early 1960s, Martin Ray planted six acres of Chardonnay vines propagated from a Burgundian selection grown in the original Paul Masson vineyard. 20 acres of Estate Chardonnay are now farmed at Mount Eden from which 1,200 to 2,000 cases per year are produced. Yields average one to two tons per acre, far below the average for Chardonnay in California. Planted in infertile Franciscan shale, the vineyards are 15 miles from the Pacific Ocean and enjoy a cool, but sunny climate above the fog line. The combination of a long growing season and naturally low yields allows slow, steady maturation of the grapes and the concomitant intensification of their flavors. This process is enhanced by vertically training the vines to maximize the exposure of the grape clusters to sunlight.