Does sassafrass grow out there?
It's a damned nuisance here on the farm, but for a fence it would grow fast, and as long as you mow the areas ya don't want it to spread to, it can be controlled.
Burns fast, hot, and low ash when ya get to taking the bigger ones down.
I have seen some grow 5' in one season in my field, and if given half a chance, the stuff would take over the place in short order.
The words "Aggressive" and "Tree" usually don't combine well, but with Sassafrass it fits. I swear the things grow in the winter, and if they had teeth, they would attack people. LOL!
If you get out this way, I'll give you all the starts you can load on your truck free, plus all the Beer you can drink.
Best of luck!!
Dingeryote