The 63 hectare, Left Bank vineyard of Chateau Maucaillou has a terroir of gravel based soils. The vineyard is planted to 52% Cabernet Sauvignon , 41% Merlot and 7% Petit Verdot . The vines are harvested using a combination of machine harvesting and pickers. The wines are vinified in temperature controlled, stainless steel vats. Malolactic fermentation takes place in tank. The wines are aged in about 60%, new, French oak barrels for average of 18 months prior to bottling. There is a second wine , Le No 2 de Maucaillou. There is also a 3rd wine, Maucaillou Haut Medoc . The production of Chateau Maucaillou is large at close to 36,000 cases of wine per vintage.