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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.
Harvest sweet potatoes before the first frost. Itâs easy to tell when tomatoes and peppers are ripe, but those hidden wonders developing under the ground donât scream harvest time like other vegetables do. Fortunately, it doesnât take a master gardener to determine when you can finally dig up those delicious root veggies, such as sweet potatoes.