Single varietals in the U.S. in most cases, must contain a minimum of 75% of one varietal type. Therefore, even a bottle that is labeled a Cabernet Sauvignon, may have up to 25% of another type of grape. Typical “blenders” with Cabernet are Cabernet Franc, Petit Verdot and Merlot. While a single varietal may have 100% of one varietal, there is no limit on mixing grapes from different vineyards as long as they are from the same vintage year.
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