Andrew Geoffrey Vineyards’ 27 acres of red wine grapes are situated within a 60 acre parcel of prime hillside vineyard property on the highest slopes of the Diamond Mountain District sub-appellation of the Napa Valley. Diamond Mountain is located along the Mayacamas mountain range between St. Helena and Calistoga. Diamond Mountain is well known and recognized for its diversity of volcanic soils, varied micro-climates, and generous amounts of winter rainfall. Red wine grapes grown on Diamond Mountain have an outstanding reputation and Diamond Mountain red wines possess a strong consumer recognition.

The unique combination of soils (volcanic ash and loam) and varying exposures (Northeast, North and Northwest) required an extensive investigation into locating and then purchasing exactly the right rootstock and red grape clones. Rex’s selection process was exacting, but required, to optimize use of the land and micro-climates within the vineyard. In 1996, Peter purchased the rootstock and clones selected by Rex. In late July 1997, sectional planting was completed.

The vineyard was originally comprised of sixty-eight percent (68%) Cabernet Sauvignon, clones 337 and 15, both on 110r rootstock, eighteen percent (18%) Cabernet Franc of a proprietary clone on 110r rootstock, along with twelve percent (12%) Merlot clones 181 and a proprietary clone of uncommon quality also on 110r rootstock, and two percent (2%) Petit Verdot clone 2 on 110r rootstock. Currently, after budding over the Merlot clones in 2003 to additional Cabernet Sauvignon and Petit Verdot, the vineyard is comprised of seventy-eight percent (78%) Cabernet Sauvignon, clones 337 and 15, both on 110r rootstock, eighteen percent (18%) Cabernet Franc of a proprietary clone on 110r rootstock, and four percent (4%) Petit Verdot clone 2 on 110r rootstock.