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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.
The key will be to ask the farmer which are ripe. He will know because it is calculated from the number of days since the trees flowered. And he will track that date carefully , if he's a good apple grower! The farmer will also know what characteristics to look for in the particular varieties that he is growing.