I had 3 plants given to me a month or so ago that were literally all in the same red solo cup. I managed to separate the healthiest from the other 2 but they were so close together and so much smaller I was nervous about trying to separate them so I left them be. Thinking when I could tell if they were male or female I'd decide which one to to grow and which to sacrifice. Also because they are not mine I don't feel right making that decision. So at this point they seem to be equally as healthy and equal in size and both appears to be female sooo... Besides the obvious of keeping them in a pot twice the size I would normally put one plant in... Is it possible to train them so that basically there is no growth between them keeping it all off to the opposite side? If so how do I go about doing this?

I have my own plants who are all rather young and obviously in their own personal pot.