Anne, the white BOP's get to be really enormous - are you ready to add a second story onto your greenhouse in a couple of years?
I have 3 or 4 big clumps of them in the garden here. This year we cut out trunks 8in. thick that were well over 15ft. tall just to keep them in bounds. My garden is not small but these plants are really much too big for where they're at.
I'm sort of saying "don't encourage it too much" because if you do, it will get too big for you too quickly. They really aren't good pot plants.