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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.
When gardeners prune, they should remove the majority of wood produced the previous season â until about 90 percent is pruned off, said Strik. The time to prune grapevines is from January through the first of March, when the grapes are dormant. There are two types of grape pruningâcane pruning and spur pruning. Mature plants should be pruned yearly to remove all growth except new one-year-old fruiting canes and renewal spurs. Grapes are produced from buds that will grow into shoots on one-year old canes.