you can regenerate - put the plant back into veg after flowering, and then flower again after a couple of weeks... easy...
What is PM? And I am happy to learn that we can get a second growth. Do yopu trim donw the plant a bit before placing it back into Veggy. I guess you would have too cause then you's have 20 Foot plants if you didn't.
I think jrrtokin has sent you a Private Message, probably detailing how to regenerate growth... good luck