I've been reading this thread with interest because I have a plumeria rooting in water. My son went to Hawaii in January and that is what he brought back for me. I am following the instructions that came with it, so it's been in water since the end of January and just got one little root since the beginning of May with bright green at the top that looks like it is trying to make leaves. I'm thinking about going ahead and planting it, but just haven't done it yet. I'm afraid our zone is not going to be conducive to having a plumeria in winter, especially one that is supposed to be the size of a small tree, lol! Really don't know what I am going to do with it if it does make it
