I ordered 30 seeds out of hawaii and got 40 in the mail. All of them germinated and some are already six foot tall. I need to cut them back to get multiple trunks. I have been giving them away all over Central Florida.
OJ, all you need to do, is give NGT some cuttings, they are very easy to root from cutting. After you cut, apply rooting hormones(gel/powder/ liquid solution) at the tip end and place in some kind of soil medium, over bottom heat. They should root out anywhere from 2-3 weeks to a couple of months.
I tired with a broken p. edulis(purple) vine, the dog broke, w/o any rooting hormones applied and still got a very high chance of success 7/10 rooted.