_Bleu_ with Adeniums, I also have them in containers, since they go winter dormant. Once outdoor temps starts going below 50F, I bring them in. Your area maybe better than mine and may do the overwintering more into December, but once you notice it starts getting yellow leaves and dropping them in Fall, it is preparing to go dormant.
I just allow mine to go dormant during the cold season. I actually like it, one less plant to worry about during winter. Just keeping it in a warm area, keeping it dry and just wait for Spring to come back. I wait till mid Spring, when overnight temps are stable already at least 50F before I bring them out slowly, in part shade then into more direct sun. I resume watering when it starts making new leaves. Making its media very gritty and well draining is important, since it stores water in its caudex. Before it resumes more active growing I may decide to improve the media, and as I do it I lift the plant about an inch or so to expose more of the caudex.
I get the blooms in July, the peak of summer, so it becomes the queen in my yard, where most of my plants are just trying to endure the dry summer heat.
If you happen to get a much younger seedling, then it will like a bit more moisture, but the more adults ones have better drought tolerance.
My Adenium still hiding indoors, totally dormant, that fat caudex remains rock solid.
When in bloom last July 2018