While Merlot dominates on the right bank, the left bank is the undisputed kingdom of Cabernet Sauvignon. This late-ripening grape variety thrives on warm gravelly soils. It is the backbone of the region's great wines. It provides the deep color, lively acidity needed for balance, intense black fruit aromas (blackcurrant, blackberry) and, above all, a solid tannic structure. Although it is often blended with Merlot (for roundness) and sometimes Petit Verdot or Cabernet Franc, it is Cabernet Sauvignon that dictates the style of the wine.