Mima, from what I picked up in another (now, -sadly -defunct) forum, Celadine is one of the easiest, and most dependable, "rooters ", and a perfect plumeria for inexperienced plumie growers (like errm, -me) . The only one Ive ever found easier to root, was a "mystery " cutting I received from a generous Plumerian, some weeks ago...I never saw any plumeria ever root as quickly, as that one did! Think it rooted even faster than Celadine, sure wish I knew what type of plumeria that cutting was from, because it upstaged my Celadine in "rootability "...(is that even a word?)
As bonus, Celadine tends to be an early bloomer.