High Quality Content by WIKIPEDIA articles! Grechetto or Grechetto Bianco is an Italian wine grape of Greek origins. The grape is planted throughout central Italy, particularly in the Umbria region where it is used in the Denominazione di origine controllata (DOC) wine Orvieto. It is primarily a blending grape, though some varietal wine is also produced. Grechetto is commonly blended with Chardonnay, Malvasia, Trebbiano and Verdello. The grape`s thick skin provides good resistance to downy mildew which can attack the grape late in the harvest season. This makes Grechetto a suitable blending grape in the production of vin santo.