The origins of the Château date back to the start of the 19th century when Bernard O’Phelan, an Irish négociant based in Bordeaux, bought two domains: Clos de Gamarey (purchased in 1805) Ségur de Cabanac (purchased in 1810) which, today, make up Château Phélan Ségur. In 1985, Xavier Gardinier bought it from the Delon family and ran the domain with his three sons, Thierry, Stéphane and Laurent. Since January 2018, Philippe Van de Vyvere and his sons have owned the château.
The Château Phélan Ségur vineyard stretches over the eastern part of Saint-Estèphe and covers 70 hectares. The vines are planted in gravel covered by sandy clay with a limestone subsoil. The château pays particular attention to its ageing process, aiming to create a wine full of finesse and elegance. The domain also makes two second wines, also from the Saint Estèphe appellation. They are Frank Phélan and the Croix Bonis which come from plots mainly planted with Cabernet Sauvignon.

When tasting, the wine of Château Phélan-Ségur has a purple, ruby hue and the mouth senses the aromas of blackcurrant and blackberry associated with floral notes. On the palette, the wine is found to be opulent and full-bodied and benefits from good aging potential.