depends on size of soil bags and size of pots.. say your pots are 5 gallon you would need like around 40-50 bags or maybe more of soil. but if you add perlite and some other organics you would reduce the amount of soil needed.i would also buy your soil in small, increments say like 10 here 10 there and maybe finish of with like 15 or 20 to avoid suspicion.
