Name: greene Savannah, GA (Sunset 28) (Zone 8b) I have no use for internet bullies!
Now that you are happy with the identification you should know that in Oregon some folks think of this as one of the more aggressive garden plants, perhaps best grown in a pot as your neighbor has done and not allowed to spread its roots into the soil. Be extra careful when repotting; any piece of root that falls onto the ground can happily grow...and grow... http://emerald.npsoregon.org/i...
Sunset Zone 28, AHS Heat Zone 9, USDA zone 8b~"Leaf of Faith"