1) White wine grape variety 
Verdiso is a white Italian wine grape variety grown primarily in province of Treviso in the Veneto wine region of northeast Italy. It is a permitted variety in the sparkling wine Denominazione di origine controllata DOC of Prosecco located north of the city of Treviso along the Piave river. ==DOC rules== To be used in Prosecco, Verdiso must be har...