Well, get yourself one of those orange tater's see, in the fall, let it sit in the house out of the way till new years, some little sprouts may start on their own, leave them be, then, first of january, put the tater in a jar with about 1" of water in it,or just below the lowest sprout, small end in the water.
Somewhere down the line the little sprouts will become vines, let them get as long as they want, when you can get a three node length off the end of a 6node long vine, snip it and put the end in a jar of water, let er get some sun, roots should start growin.
At least one month after the threat of frost is passed, then start yer vines in the garden, the young plants
are not very tolerant to a late frost. The mature plants
in the fall do okay though. There ya have it.
That's how the neighbor does it, and he has fresh greens year round, and his vines get 6'-8'long, so it must work.