Hi Neighbor Terrinj!!
You've heard my story. I have no where in my yard that is sunny enough for a plumeria among others plants that I love. But that didn't stop me from trying. Happy to say I have info on the old mystery NOID. And today I discovered inflo on my Riviera Rainbow that has been through some drama. Two of it's branches broke off and are currently in pots.
Currently I have 6 very large plants in very large pots and a smattering of <4ft ones that join them. The plumeria and BOP are the only ones on the driveway requiring full sun. I have a hose connection with the water spitgot on and always ready for me to give them a nice soak and spray from overhead. So far, that hasn't interrupted my lifestyle. But then I only have 12 or so pots that need that attention. And with the summer rains we've been having, it's been great and the plants are loving it! In fact, we're getting thunder and a very good downpour as we speak.
I will think about cutting down my NOID into pieces. But so far I have been able to winter it over nicely and it seems healthy. But if you and Hetty think it is struggling in a pot, and it absolutely requires cutting back, I will think about it more. I am just going to need Prozac to do it a that process scares me to death! I think the roots won't be any smaller from cutting it back, in fact the rot ball might even grow more. I guess you might be talking about doing this in dormancy.