I have noticed my seedlings are responding to the colder weather... the leaves are turning strange sad colors, and simply dropping off. I know this is in response to fall and upcoming winter.
I've never really done anything to protect my established adeniums from the mild South Florida winter. But I don't know if I should be doing something different with the young adeniums.
What is your advice?

My only suggestion is to feed them one last time and water well then just let them alone till they come out of dormancy, mine start looking pretty sad about this time also, but the blooms keep coming ! We get just enough rain during the winter so that watering is not necessary. This week I fed all my trees and plants and also sprayed with a nutritional spray and now all thats left is weeding weeding weeding I think some folks tend to love they're plants to death, I'm a believer in "tough love". I try to give them just enough and no more. Works for me.