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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.
Climacteric fruits like plums will ripen off the tree. A casaba melon is ripe when the blossom end is slightly yielding. The mamey fruit should be soft to the touch when ripe. Bananas ripen off the parent plant. A variety of ripe apples. Grapes will not ripen any more after they are picked from their vine. Storing fruit in the refrigerator can prolong its shelf life. Tangerines should look plump and juicy when they are ripe.