Grape Nutrition, Selection, Storage and Availability Grapes are 80%water, are low in calories and sodium and are a good source of fiber. When buying grapes, pick up the bunch by the stem and shake gently—if grapes drop off the stem, they have been in storage too long. Grapes are fresh when they stay firmly attached to the stem and are plump and bright. To store grapes, keep in the coldest part of the refrigerator in a plastic bag. In Wisconsin, grapes can be grown anywhere except in the northernmost part of the state. Most grapes grown in Wisconsin are used to make wine. Grapes ripen in Wisconsin in mid-August through September.
Grape Extras The grape is one of the oldest fruits to be cultivated. Spanish explorers introduced the fruit to America approximately 300 years ago. Grapes come in more than 50 varieties in black, blue, blue-black, golden, red, green, purple, and white. Annual world production of grapes tops more than 72 million tons.
Information from the Wisconsin Department of Agriculture, Trade & Consumer Protection, the University of Wisconsin-Extension and the United States Department of Agriculture.