Petit Verdot is a red grape variety that is traditionally used in Cabernet Sauvignon ( Bordeaux) based blends. It's home was the Medoc, where its production slowly dwindled over the years. It has started to be replanted and is especially useful for providing body, tannin, colour and acid to blends. Outside of France it is grown in small quantities in Argentina, Chile, Italy and the US. In Australia, Petit Verdot has gained popularity as a straight varietal, where it thrives in the warm regions surrounding the Murray River. There are also excellent Petit Verdot wines being produced in Barossa and McLaren Vale.
Whilst Petit Verdot can be made in to a straight varietal, is is most commonly blended with other varieties, like Merlot or Cabernet Sauvignon. The traditional Bordeaux blend is made up in varying proportions of the five noble red grapes that are grown in the region. They are Cabernet Sauvignon, Merlot, Cabernet Franc, Malbec, and Petit Verdot.