The plateau of Grand-Puy is west of the village, above the hamlet of Bages. This outcrop of the terrain (called a "puy" in the old local dialect) rises to around 20 meters above sea level. Grand-Puy-Lacoste enjoys an exceptional terroir. The soil is gravel, the alluvial stones which ensure an excellent drainage of rainwater. This gravely soil has the advantage of absorbing heat during the day and releasing it to the grapes at night, eliminating excessive variations in temperature and promoting even ripening in the grapes. The vines and their care are under the responsibility of Antonio Flores, Vineyard Master at Grand-Puy-Lacoste. Since its acquisition by the Borie family in 1978, the vineyards at Grand-Puy-Lacoste have been patiently replanted. Today the balance between young and old vines is fully established, averaging over 40 years old. The domain is planted with 75% Cabernet Sauvignon, 20% Merlot and 5% Cabernet Franc.