Ugni blanc is a grape variety that probably makes more white wine in the world than any other. It gives good yields, but makes undistinguished wine at best. It can be fresh and fruity, but doesn't keep long. Its high acidity makes it important in Cognac production.
It may have originated in the Eastern Mediterranean, and was known in Italy in Roman times.
The vine is vigorous and high-yielding; with long cylindrical bunches of tough-skinned berries that yield acidic yellow juice.