Home Wine Grape Varieties Tinto Cao (red) Decanter Staff August 13, 2010 One of the rarest, high quality port grapes grown in the Douro Valley, highly prized for its spicy character. Written by Latest Wine News DWWA 2022: Sneak preview of styles to look out for Last Places Remaining: Rhône Tour With Matt Walls Angélus, Palmer, Léoville Barton join 2021 en primeur releases