I have been wanting to try these Manny but have not tried to plant any as yet. My understanding is that they winter over well in the ground and act like a perennial. When you dig up the tubers you can't get them all, at least some of the roots will stay in the ground to come back next year. At least that is how I understand they work, some one with more experience with them may have better information
but that's my story, and I'm sticking to it.
The one thing I have heard over and over again [ Besides the fact that if you only had one food to plant it should be this one because they produce so much per sq ft ] is that they make you pass gas. This apparently becomes less of a problem once your body adjusts to them, but every one seems to say they tend to make you Fart.
So be prepared, it may be a bit fragrant around the house for awhile.
Never doubt that a small group of dedicated people can change the world, indeed it is the only thing that ever has.