Defiantly tetrapanix
Be really careful planting!
If left completely alone, and the roots undisturbed, it will only grow a single, tree like plant..if those roots are disturbed, even a fine hair like root, it will sprout a new plant!
Even a rodent rootin around down there will fire em...
Get tired or scared of it and try to dig it out, you will insight a full scale riot!
There's some really neat form of it out there, they sport different leaf shapes!
They all get really big!
The old leaves fall off in winter and don't grow back but the stem will resprout. They kinna get a palm tree look to em after a few years, because of this.