I'm not exactly sure where I read it, but remember that I warned you that I read something that said Pachypodium are not very cold tolerant. It may be this site below, I can't remember, but there's an excellent article at davesgarden.com... Crimminy, now I have to go look for it. Hold on for a second... Ok, I'm back. I was right. Go read this article... Very informative...
https://davesgarden.com/guides/articles/view/539/
Remember... Watch your temperatures for your Pachypodium. This page says that the minimum temperatures are between 13 and 15 degrees Centigrade which is 55 to 59 Fahrenheit. Again, an excellent article that's very informative. Lots of very useful information.
http://www.seedsplants.com/en/Pachypodium-en.htm