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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.
Another way how to tell when pumpkins are ripe is to give the pumpkin a good thump or a slap. If the pumpkin sounds hollow, that the pumpkin is ripe and ready to be picked. The skin of a pumpkin will be hard when the pumpkin is ripe. Use a fingernail and gently try to puncture the pumpkinâs skin.