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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.
Get out your knife. A tomato must be at least âmature greenâ to ripen off the vine, and if youâre not sure if yours are at that stage yet, sacrifice a representative fruit. Slice it open, and look inside: If itâs gelatinous, it has a chance of ripening after harvest.