sentences:  However, the most notable grapes grown in the area include Cabernet Franc, Chardonnay and Viognier.The hardiness zone is 7a except in some higher vineyards which are 6b.The earliest recorded attempts at winemaking in the area occurred in the 1770s, when Thomas Jefferson provided financial support to Italian winemaker, Phillip Mazzei, who made a small quantity of wine from the native grapes, but without much success.