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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.
Without being fertilised (in most cases), the ovules will not develop into seeds, any more than pollen can. So in order to develop into seeds, the ovules must first be fertilised. We can often judge how close the seeds are to being ripe from the size or colour of the fruit or seedpod. This is a Passionflower. In the photos, the petals are brown and shrivelled at the top, and the dried stigma is at the bottom.