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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.
Nearly all grapefruit in Florida can be harvested as early as September or October, but they may still appear green on the trees. Commercial growers spray green grapefruit ready to eat with a de-greening solution. Although grapefruit are ready to pick in October, the fruit can stay on the tree for a few months.