Château Calon-Ségur, the most northerly of all the Médoc Grand-Crus Classés, is the château with a heart on its label. That is because the former owner, Marquis de Ségur, though he owned such Estates as Lafite and Latour, he declared "My heart belongs to Calon". For the last century, it has been owned by the Gasqueton family.

Calon-Ségur's 74-hectare vineyard, which is partly enclosed by a wall, is located just to the north of the village of St-Estèphe. The vineyards (Cabernet Sauvignon 65%, Merlot 20%, Cabernet Franc 15%) lie on up to 5 metre-deep gravel beds mixed with sand and, in parts, limestone and clay.

The wines are fermented for 3 weeks in enamel-lined steel vats and are then matured in oak barriques (40% new) for 18 months. Recently, Calon-Ségur has hit form with notable successes in 1995 and 1996 and 2000. At its best, Calon-Ségur produces meaty and concentrated wines displaying excellent depth of fruit and superb length. It is classified as a 3ème Cru Classé.