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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.
How to Tell if a Plum is Ripe. When I buy produce, I make sure that every item put in my bag is ripe and ready to use. An underripe plum is hard, tart, and lacking in the juicy sweetness we associate with plums. So when choosing a plum, be sure to remember the following: Use your eyes: Color will not tell you if a plum is ripe in all varieties. My plum tree is a purple variety, and the plums are the exact same color when they are ripe as they were when they first began to grow.