Indiana corn grows a bit taller than Illinois corn I guess. I have no idea about pot plants. But corn in Tippeconoe County reaches 6-8 feet in June. By the time the detassling is done, it's a lot more like 9-11 feet.
The farmers around here grew hemp during the war; when it was harvested and laid on a hay rack, it hung over on both sides. Easily 10 to 12 feet, if not more.
Corn here grows to 7 to 8 feet.
I just cited that for comparative purposes. I don't know what the relative sizes are in Lubbock, Texas.