It would help a lot of you could write in full sentences and try to use correct spelling. I do not know about the others, but I have to read each post 4 times to get some idea of what you are trying to say. Simple things like using Their instead of there, and not using abbreviations which might be logical for you, but not for thr rest of the world would help.
Are you saying you keep ligustrum at 15 degrees? I would say that is on the warm side. Mine stay out at take up to about -5, -7 before I consider putting them in a shelter.