From The Winemaker
Petit Verdot (“peh-tee vur-doe”) is a full-bodied red wine that originates in southwestern France (in Bordeaux). It is highly desired as a blending grape in red Bordeaux blends because of its plentiful color, tannin and floral aromas of violet. Because Petit Verdot is such a bold wine, it is commonly added in less than 10% of most wine blends. The wine is also rarely produced as a single-varietal wine
Petit Verdot translates close to “little green one” and this is most likely because this grape is a late-ripening, warm climate variety. In Bordeaux, it meant that the grapes were often not quite ready (e.g. a little green) when they had to be picked for harvest.