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The color of the vine also indicates when to harvest Concord grapes. Throughout the growing season, the vine and stems are a light to medium green. When the vine and stems begin to turn to a light then medium brown, it means the grapes are ripening and ready to harvest.
Grapes continue to ripen after being pickedârefrigerate grapes to slow down the ripening process. You can determine freshness by examining the stems: Fresh grapes will have green and pliable stems, while grapes that have been stored for a while will have twiggy and woody ones. Kiwi.