The most popular Bonarda-based wine in the North American retail market is made in Argentina where it is the second-most planted grape variety, just behind Malbec. You’ll find my most recent Bonarda wine reviews and ratings here. 5 Surprising Facts about Bonarda: 1. Bonarda is a late-ripening grape variety that requires a large shift in temperature from day to night, so that the wine reaches high enough sugar levels without overheating and creating a stewed wine. 2. The Mendoza Valley in Argentina is ideal for creating this climate for the grape and is where the majority of the plantings are. […]