The leaves have not yet formed and roots probably.
The inflo is now 3 weeks old.
Will it ever bloom?

Fr.Damien-Marie

I'm not sure what that is but if it has no roots and no leaves, the only thing supporting flowers is the energy stored in the stem. If the stem is putting all its efforts into growing a flower before it dies its not growing roots or leaves. Unless there is a lot of energy stored in that stem, your cutting is doomed.

Yes in about 6 weeks your plumeria will bloom. If you are sure it has roots, it will slow down in leaf production. If it has not rooted yet, it will take root slower. Do not water this cutting until it produces keaves.

I FIND IT AMUSING THAT THE PLUMIE PEOPLE FOR THE MOST PART, HAVE COMPLETELY DIFFERENT ANSWERS AND RESPONSES.
THIS LEADS ONE TO BELIEVE THAT THERE IS NO ONE WAY TO DO ANYTHING.
FR.DAMIEN-MARIE

We do whatever works sometimes. Then repeat.

It may continue on blooming, must be latent buds from previous season. But as Cheryl suggested, do not water yet, got to see good open leaves. Good luck! Hope it manages to bloom and then grow new leaves. Feel the stem, if it is staying firm then it is okay. If it is softening, then that will be a problem.