- (Geneva Red 7) (Buffalo x Baco noir) highly vigorous, highly productive and winter hardy, with moderate resistance to diseases. 'GR 7' makes dark red wines with a classical hybrid aroma. It has better tannin structure than Baco noir and De Chaunac. It still has a short finish. It is best made as a light (not heavily extracted) wine. Use hot pressing, short skin contact time or some carbonic maceration. It has a place in traditional red hybrid blended wines, and is already in limited commercial production. Predicted temperature of 50% primary bud kill in mid winter = -17.1 F *