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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.
Harvest Maturity It is important to pick avocados when they are mature, as immature fruit will shrivel and not ripen properly. Several indices may be used to determine avocado fruit maturity. Skin texture and appearance is an indicator of harvest maturity in most avocado cultivars.