Trefethen 2020 Cabernet Sauvignon. "Trefethen Estate winery is one of the few in Napa Valley that's never bought any grapes. All of their wines are produced with grapes sourced from their estate vineyards, mostly the 61 vineyard blocks that make up their Main Ranch. The establishment ... - Trefethen 2020 Cabernet Sauvignon. |