It would help if you would go into your profile and let us know where in the world you are located. It's difficult to answer when we don't know your climate, and whether you grow them indoors or outdoors.
Here is some info that may help you. http://adenium.tucsoncactus.or...
Name: Deborah midstate South Carolina (Zone 8a) Don't Sweat the Small Stuff!
Yes, here's the link: https://garden.org/forums/view... There are some very knowledgeable gardeners there, who will better be able to help you and answer your questions.