I forgot to welcome you to the NGA, aka ATP, DeDe.
I am not quite sure what you are asking about the flower spike. You'll have to tell me what "trimmings or cuttings" means. Perhaps if you simply explain how you will handle these two plants over the fall and winter months, I will know how to answer your question. There are more experienced Plumeria growers than I, so perhaps some of them will chime in with suggestions.
