There is no single predominant grape variety in France's Loire Valley. Fine wines are made from a large number of varieties, some well known and some particular to the region. However, all Loire Valley grapes have certain qualities in common. All of them can ripen fully in the relatively short growing season. The mild climate also insures relatively high acidity, which gives the wines, no matter how ripe, a refreshing leanness. Thus the Cabernet Franc, Chenin Blanc and Sauvignon Blanc wines show their best qualities in the Loire Valley and set standards for the rest of the world.