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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.
You know a tomato is ripe when 1  â. It has turned red on the vine (or yellow for yellow tomatoes, pink for pink varieties, and so forth).  Its color is even. In other words, ripe red tomatoes donât have one side thatâs green. The entire tomato has color.