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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.
Evaluate the color of the grapes in order to determine sweetness and ripeness. Fully ripened grapes will offer the most antioxidants. The color of the fruit would also depend of the variety, so know the proper grape variety that you wish to purchase.