Dolce’s 20-acre vineyards are located in Coombsville, east of the city of Napa, and are situated at the base of the Vaca Mountains, which define the eastern border of the valley. The volcanic soil is loose and well drained, and the west-facing vineyard is protected from the prevailing winds so that the damp, morning fog of autumn—a very important factor in the development of Botrytis cinerea—hangs longer amongst the vines, often until midday. A combination of high humidity followed by drying conditions encourages, but does not guarantee, the growth of Botrytis. As the mold develops, its coverage is seemingly random with individual berries succumbing to Botrytis at different rates, if at all.