I have news and I have a theory, and I may be the only one in the world with this theory.
The news is, and I was told this by the "plumeria expert" on ATP and another one that befriended me when I started getting interested in growing them. The last expert is with the Plumeria Society of America. Anyway, I was told that seedlings will take 3-5 years to bloom and sometimes even longer. I am sure that's why I see so many people, just like you, who have said they had plumeria for years and never saw a bloom. With all the new plants out there, many of them are 1st year seedlings. Unfortunately, the seller doesn't often tell the buyer this.
Have you followed my thread "I just knew I would make history" and then "Seed pods" on the Plumeria forum? If so you know that I grew a seedling that bloomed at 15 months and had seed pods at 17 months. So, even the experts don't always know.
My theory is that plumeria seem to bloom the best when the plant is cut back. For me at least, it seems that this triggers something in not only the "mother" plant but also the cuttings that causes them to bloom more readily. Maybe its just me. As I said, I am perhaps the only one who believes this. I cut my plumeria back all the time and I have lots and lots of plants that bloom. I have some that are still in full bloom right now and are gorgeous. Two of them are seedlings and the oldest seedling is 2.5 years old. That one and the 1.5 year old one have been in bloom for over two months. Six of them are cuttings, taken either last fall or this spring. My plants, at least a lot of them, do tend to bloom a couple of months later than those who grow theirs in Florida.
