yes it can be done, but is best not to

MJ likes to stretch her feet.. esp deep.. the more room for root growth, the better... .2 plants in one por restricts roots, leading to other problems

also if you have one of those plants end up male, it is impossible to safely separate the roots, so you have to chop it down, leaving dead roots in with your girl

in the future it would be best to keep 1 plant per container