Christopher, use a magnifying glass and look at the underside of the leaves. You're looking for tiny spider mites. Also, if you haven't already, re-list this post on the Adenium forum.

Hi Christopher!!!

Your Adenium is looking pretty good for this time of the year. Most of mine have lost most of their leaves and i have reduced the water. Mine are in the sunroom and have a few leaves and are starting to bud now. I also have some under my T-5 lights that dont look as good as yours. I just received some from R from Taiwan and they came barerooted a few months ago. All are budding now and are starting to take off.

I would agree with bikerdoc and check for spider mites. If you don't see any, then i wouldn't worry to much. They will drop their leaves more so than normal this time of the year. Some varieties lose more than others.

Have you cut back on the amount of water duting the winter?

Come and check out the Adenium forum.. lots of great people there and great info too! We would love to see you there!! ;-)

Your Adenium is looking pretty good to me!!

Take care,

Laura

Christopher, whilst not trying to 'poach' you over to the other side (the Adenium forum), I too feel you ought to ask over there for possible answers to this problem. I hope you get some answers. It's a bit slow as most Adeniums are dormant at the moment...a bit like us I guess, but we will wake up soon.
Gill from the UK.

OK, folks, you convinced me, I posted this on the Adenium forum...

Laura, this Adenium is one of two I have that I grew from seed. The caudex was for the longest time a bit soft, but putting outside for the summer helped to firm it up, and it has been healthy ever since. The leaves have never completely fallen off, I water the same as I usually do, as it is always warm in the apartment, they never go dormant.

Christopher