realistically
...forget about 10lb plants...
Average is 1-3 per...You can grow good where ever you are....and I have seen 12ft plants in northern Indiana...so they will grow where you are.
If you are planning a guerrilla grow [you are?!] ....put out 4X as many plants as you want...Expect losses!
Site selection is critical. Corn fields may provide a soil indication. Look for nettle "bogs" and plant there, too. Tall stands of ragweed will provide some cover....and deer will waste a patch, in a heartbeat.