Hi divij! Welcome! Adenium can certainly set seed, but there is no set length of time which guaratees seeds. They have to be pollinated which is usually done by small insects or moths. If pollinated, they will grow a seed pod where an old flower bud was I believe. The seed pod ripens after a few months it will start to crack open and they are ready to harvest!

Good luck and please feel free to share any pictures or questions here, we would love to see your progress.

A friend pollinated their own plant by dipping the middle spindly bit of a picked flower into each of the other flowers on their plant. They god a couple of seed pods from that. I have been lucky and got random seed pods. I got two on one plant and let them grow and planted the seeds...then had about 5 on another plant and i didnt want any more or to take the growing power away from the rest of the plant so i cut them all off when they were small.