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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.
Look for a light yellow color that intertwines with the usual reds of a nectarine. A light yellow indicates ripeness, while the reds are there for looks only. The yellow may appear to be tinged with white, which also indicates the fruit is ripe. If you have white-fleshed nectarines, the mature color should appear white.