Petit Verdot is a variety of red wine grape, principally used in classic Bordeaux blends. It ripens much later than the other varieties in Bordeaux, often too late, so it fell out of favour in its home region. When it does ripen it adds tannin, colour and flavour, in small amounts, to the blend. Petit verdot has attracted attention among winemakers in the New World, where it ripens more reliably and has been made into single varietal wine. It is also useful in 'stiffening' the mid palate of Cabernet Sauvignon blends.

Bordeaux wine is produced in the Bordeaux region of southwest France, around the city of Bordeaux, on the Garonne River. To the north of the city, the Dordogne River joins the Garonne forming the broad estuary called the Gironde; the Gironde department, with a total vineyard area of 110,800 hectares, is the largest wine-growing area in France.