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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.
Limes, on the other hand, are yellow when they are completely ripe, but are picked while they are still green and are best when picked just before they ripen. Ultimately, the best way to determine whether or not a lemon or lime is ripe and ready to be picked is to pick one of the fruit, cut it open and taste it. Harvesting. Unless the fruit has been exposed to frost, lemons and limes not do well if they are picked before they are ready.