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Why Grape Shatter Happens | The Wine Virgin
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Why Grape Shatter Happens

April 10, 2008

Recently, we had a question from one of our readers - Ferhat, hailing from Istanbul, Turkey asked: Could you tell me why grape shatter happens please?

Ferhat, absolutely…

You see, small grapes have a tiny end on them which functions basically like a cap. As the grapes grow larger these caps fall off. But sometimes during a cool, wet spring… like how we are having right now in the southern U.S., a crop of grapes can fail to develop properly and this will lead to the cap at the end becoming very tough.

Now, when the warm weather of summer finally arrives and as the grape matures on the vine, it will begin to push up against this cap that is now very tough. The end result being is that instead of the cap falling off as it normally would, the grape actually shatters against the cap due to the pressure of being pressed up against it. When this occurs it can destroy whole yields and leads to what is known as a poor fruit set with bunches that only have a few grapes.

Grape shatter is a major concern that puts many vineyards at the mercy of the weather each and every year. Also, as a tid bit of wine trivia for you, grape shatter is known in French as Coulure. Click on that term and you will find some more info on the different ways that grape shatter can happen and the other problems that stem from it.

Ferhat, great question and I look forward to hearing more from you again along with our many readers out there that are curious about this beautiful and wonderful drink. Cheers!!

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