Yeah I realized I'm going to need to get him his own greenhouse or something. I thought I could prune him enough to fit but once he got outside he just went whoomph! But omg the bees LOVE him - almost as much as they love the borage. Between him and the borage I've got dozens of bees in my yard at any given time.
I kept a bunch of these guys in one gallon pots for a while and they will flower at that size. They seem to want more room but will accept the smaller pot. I still have one, actually, in that size. The rest are in tiny pots till I have the mythical "more time" for potting up. The gemination on those seeds was amazing.