Karen, for me it is a matter of observing dormancy when they have to go inside. They are dropping leaves, so I slow down watering. Some start growing during the Winter, I water them generously. And I find that repotting Pachypodiums in the Spring can be deadly if one doesn’t use a super fast draining medium with very little soil. Years ago I killed a really large Pachy laelii that way, when we had a very wet Summer. Better at that point to be potbound and repot inside in the Fall.