Mosiah, I'm pretty sure I've only seen JAs propagate from tubers. Hard to tell though, I may have attributed spread to the wrong thing...
Considering how prolifically they increase that way, the idea of them producing viable seed freaks me out ! A bit like comfrey: my cultivar only propagates from
root dividions, and that's fine by me!
It's easy to get tubers over here; considering how many permies have JAs, you could well do a deal.
i just saw Brenda's post: you're not in Mchigan by any chance?