Source Napa produces wines in California's Napa Valley, a region defined by its temperate climate and diverse soil compositions that support both classic and experimental varietals. The winery's Heart Block Sauvignon Blanc, made from the aromatic white grape, demonstrates the precision possible in the valley's cool-climate zones, where Sauvignon Blanc develops bright acidity and mineral character. The Heritage Sites offering rounds out the portfolio. Wine Enthusiast has rated the winery's releases, with Heart Block Sauvignon Blanc earning particular recognition at 94 points.