Glenn, while I have never had a Plumeria bloom for me yet, the day is coming!! I have about 20, all from seed, some are now over 1 1/2 feet tall. I bring them in through the Winter, under lights, and back outside when the warm weather comes. There is a fair chance I may see one or two blooms before I "slid into home plate" for the final time!!! Just my thoughts, but I would never knock any green leaves off a Plumeria, at any time. I am certain there are those, way better versed on this topic than me, but I strive to keep the leaves on the plant all year long. You may be suggesting that they go dormant, and you may well be right, I know my Bouganvilleas somewhat do, but not drop all their leaves. Ever had a bloom? Post a pic for an aspiring, older-than-dirt wannabe Plumeria grower up here in Canada.! Cheers!