A 3 year old grape vine is still a baby, so it may well be that all it needs is time. Also, make sure you're leaving the fruit on the vine long enough. And most important, make sure your vine has optimum care. This article should help you get started. https://www.gardeningknowhow.com/edible/fruits/grapes/growing-grapevines.htm
Answered on October 11, 2014
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