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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.
Big Boy tomatoes are ripe and ready to harvest approximately 78 days after germination, depending on weather conditions. Unusually cold weather will delay ripening, while warmer weather can cause tomatoes to ripen faster on the vine. Harvest green tomatoes before the last frost and ripen them indoors.