Château Sociando-Mallet is located in Saint-Seurin-de-Cadourne in the Haut-Médoc appellation . It was bought by the Sossiondo family in 1633 and later became "sociando" due to a spelling error in the name of the owner family. In 1831 the estate became Château Sociando-Mallet when the owner of the château married Achille Mallet. But since 1969, it is Jean Gautreau who has been at the head of this Cru Bourgeois.
The estate covers 85 hectares with vines averaging 30 years old. They are planted on a Guntzian gravel soil and on a clay-limestone subsoil. The two main grape varieties are: Cabernet Sauvignon at 48%, Merlot at 47% as well as in very small quantities Cabernet Franc at 5%. The wine is aged for 12 months in barrels.
Château Sociando-Mallet produces a second wine; La demoiselle de Sociando-Mallet , which is a wine made from the youngest vines on the estate.