Look for fresh green stems. Dry stems indicate the fruit has aged. Firm are best: The grapes should be firm with no signs of shriveling, and check their color. Pay attention to color: Red and purple ...

Just one is about four times the size of an average grape. But inspectors look even closer. If the color of these grapes matches categories three or four on this color card, then just one bunch ...

The University of Minnesota Horticulture Research Center (HRC) in Excelsior, Minn., breeds new varieties of wine and table ...