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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.
Sour grapes aren't ripe and haven't produced the sugar that makes them sweet yet. Also, wine grapes tend to be more sour and table grapes tend to be sweeter.Wine grapes a â¦ ren't necessarily intended to be eaten and table grapes are.+ 13 others found this useful.our grapes aren't ripe and haven't produced the sugar that makes them sweet yet. Also, wine grapes tend to be more sour and table grapes tend to be sweeter.