You could prune them back and allow them to resprout new growth which would have time to set fruit if you prune them now. Another option is to start a new plant from the old ones this time of the year. Take the end of a vine and lay it in a hole with about 6" of the end sticking out. Cover it with soil and water the spot well every day or so for a week. In a couple of weeks, you can cut the new plant from the "mother plant" and remove the mother plant.
Thanks for the question. Please stop in again soon!
Q&A Library Searching Tips