I have the standard species I planted out this spring, as the Steroidal Giant is hard to find, but I love it. I separated my first Tetrapanax sucker today, and plan on growing a forest of it. Finally I found something aggressive enough to grow under these hickories that are full of Juglone toxin. If a person had a small yard, I can see there might be reason to be afraid, the sucker popped up about 3 feet away, and grew through packed dry clay and rocks that was at one time a driveway converted to lawn lol, in good soil it might have traveled much further.
