soil depth???

Hey ll, Im looking for someone out there with enough expierence to tell me how to figure out a minimum soil depth for a given size plant... IE a 16 inch plant needs an x by x osil container in order to staqy healthy, anyone with any knowledge out there would be really helpful!

general rule of thumb is that the roots are as tall as the plant

so for 16 inch plant you should consider 3 to 5 gallon pots

but remember that once put in flower it can triple in size