Ugni Blanc is of Italian origin (Trebbiano Toscano). It produces high yields (120-130 hl vol/ha) and is particularly resistant to grey rot. A late-budding variety, it is at its northern maturation limit in the Poitou-Charentes region. The grape’s high yield and late maturation offer numerous advantages in producing wines for distillation. They are low in alcohol and acidic – two essential elements in the ultimate quality of the Cognac. The acidity preserves the wine naturally during the winter months before distillation and the low level of alcohol enables greater concentration of the aromas present in the wines.

Source : http://www.pediacognac.com/en/le-vignoble/ugni-blancugnic-blancugnic-blanc/