Duckhorn Merlot 2015. Napa Valley. Duckhorn Vineyards wrote the book on Merlot and have become incredibly consistent in producing top quality Merlots. The 2015 Napa Valley Merlot is right on target. This wine exhibits beautifully ripened fruit and excellent balance. Its aromas and flavors of ripe red fruits, an accent of oak, and excellent palate tension make it a superb choice with a juicy ribeye.