Riesling grapes, which originate in Germany's Rhine region, have sweet fruity flavors and aromas of flowers and fruits. Other characteristics of wines made form Riesling grapes include high acidity and petrol notes if aged. The character of a Riesling wine depends heavily on where it is grown because Riesling grapes are very 'terroir expressive.' Rieslings cannot be oaked like Chardonnays and the oak flavor is part of what draws people to Chardonnay.