I don't know, David. I have had plumeria in bloom since April. For some reason the Celadine bloomed early but quit blooming by mid-summer. Vera Cruz Rose started blooming in June and I have some of it still in bloom. Scott Pratt started blooming in June too, but none of it is in bloom now. Slaughter Pink, Madame Gillabert, Jack's Compact, and Honeysuckle Rose have all been in bloom since July and is still going strong. I have some Celadine and Scott Pratt with inflo. and I expect to see it blooming again this fall. But since I have never really attempted to maintain plumeria in bloom through the fall/winter, I don't know what to expect. I have a feeling that part of my problem in getting some of the plants, such as the Celadine, to continue to bloom throughout the summer is that I now have so many doggone plumeria (and having to deal with a thousand other tropical plants), I just didn't up-pot and fertilize like I normally do. I need to scale back my "operation".
We have a house-full of friends, up for the MSU-Bama game, and one of the ladies grows lots of plumeria on the MS Gulf Coast. She said none of her plants have been in bloom for almost two months and wanted me to tell her how I managed to have so many still in bloom, considering her climate is far better suited to growing tropical plants than is mine (I am approximately 300 miles north of the coast). I could not tell her what I did to have bloomers now. I told her my plants just like to grow well for me, that it was sort of a "family" thing.