Samples will be made into wine to compare differences between Merlot grown on rootstocks and own-rooted vines. Dr. James Harbertson’s wine phenolic research could help Washington wine grape growers as much as winemakers by providing baseline information about tannin levels of wines –produced in their region. The subject of wine phenolics is not just for winemakers and enologists. Wine phenolics are responsible for important wine attributes and include compounds like tannins, anthocyanins, polymer pigments, and antioxidants. Grape tannins, which are developed in the vineyard, primarily in the seeds and skins, help stabilize the color in wine and cause the “mouth […]