Answer: You can cut back the plants now and they will resprout, grow and produce in fall. Not all varieties respond the same to this, but I have had some success doing it. There is another way...
Some Texas gardeners will start a new plant from an old one this time of 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.
By September your new plant will be producing for you. Make sure and keep mites and other pests under control. Keep the plant growing vigorously with occasional fertilizer applications.
Good luck with those fall tomatoes!
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