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Did you completely cut theDid you completely cut the main vine? If so, there's not much you can do. The watermelon can no longer receive the nourishment and water and will stop growing. If it's just a slit, then you could try some pine tree gum and duct tape!

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?