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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.
Then, squeeze your juice into a cup. Use the juice to make your measurements, and then write down your results. Enjoy picking your grapes, then measure a sample for sugar, acidity and pH and record it. Then, sort through your grapes. Pick out any green, moldy or shriveled berries and you're ready to start making wine.