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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.
âThis large range in ripe grapes is an important source of variation in quality.â âI'm not quite sure how this would work on a large scale, but at least it's an idea.â âHad it done so, pain and tragedy and loss on a very large scale could have been avoided.â