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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.
For the best batch of organic grapes (Vitis), it is essential to pick the grapes when they are ripe. See below for ways you can test for ripeness. Tasting is the best test for maturity. If grapes are sweet and flavorful, they are ready to pick. The next best guide is color.