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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.
Pruning your grape vines every year is essential to produce good yields of quality fruit. The best time to prune is when the vines are dormant. Grape vines produce fruit only after they are more than a year old. They need to be pruned from the second year onward. How you prune depends on whether you're growing grapes to eat or to make wine.