Based on your description I would consider cutting it in March. After cutting New Branches form from old leaf nodes so if you do not leave some on a branch it will not regrow. I would cut a branch about six inches from the joint and that would give the best chance of re-branching.

I would also consider a larger pot. Go as big as you can. There are also many discussions on fertilizers but most Plumeria experts would recommend staying away from such a high middle number. Plumeria expert Jim Little states in his book a balanced fertilizer will work in most cases. good luck

Thank you for your response. On a closer examination the pot is actually about 17" not 12". I know it is very root bound but I don't want to increase the pot size as it is not very managable as is. I also only feed it 15-30-15 now in the summer months and sometimes will give it fish emulsion 5-1-1, or 15-15-18 once or twice in the winter. I also flush the soil a couple times when the plant is outdoors in summer. It's been growing in Pro-mix HP for the last couple years so not much organic matter or nutrition other than the fertilizer I give it.
I'll take into account of where you say to cut the branches but until I can post some pics I won't make any cuts. I'm afraid if I cut it back too much it won't bloom again for another few years.

You could root prune it in the early spring as well. That would help with being root bound and would improve the overall health of the plant. I would cut the roots back to about the same diameter as a basketball. Maybe just under that diameter considering the size of your pot.

As far as not getting any blooms I guess I was under the impression that it's under performing for you right now. In my opinion this spring would be the best time to branch prune it and next year you will have a much stronger chance of blooms. Besides if you root the cut branches you may still enjoy any potential blooms that you may have cut off.

Since you are so far north I would also recommend a consistent fertilizing plan from mid spring to early autumn. I am a beleiver in using what you have available and those are the ferts you can get then those will work just fine. Simple consistency will give you good results and then you can build on it from there if you choose to.

I hope this helps.

Excellent advice K., I bet root pruning would do wonders for the plant Will07, freshen up your soil mix at that time too - a well draining mix.

I'm very ignorant when it comes to pruning the roots. If I prune the roots should I also prune branches? Should I increase fertilizer and water? I feel like if the plant is doing fine don't mess with the roots!

Believe it or not, pruning the roots actually invigorates the plant because as the roots branch out you get finer and finer roots that mostly become unuseable to the plant due to constriction, etc. Pruning the roots will breathe new life into your plant, guaranteed. Being root bound is not doing anything for your plant.

When you prune the roots, replace the old soil with new soil since you'll have everything out anyways. After you re-plant, water it in really well and don't water again until the soil dries out. I would personally probably wait to fertilize for a few weeks to let the plant re-adjust.

Pruning the branches is a totally seperate issue that can't advise you on, but many on the forum can.

finally got pics of the plumeria