Good question--I would like to know the answer myself! I would guess at point no. 2 but I'm new at this so I could be wrong.

Mike in MN

I would be likely to prune just at the bottom of the #2, just above a nice group of nodes to form good branching.
I would want to hope for a nice balanced looking plant in future.
My thoughts,
Rick

I just cut some back today for the second time. I would cut between 2 and 3

I agree with Chrisware. Cut between 2 and 3 to form a good branching. Cutting at 2 will be fine also . Just my thoughts. Let's see what others say.

Great!! This is excellent info for the future when my plants start getting that size. How old is this seedling, by the way? Since I have well over 120 seedlings, most about a month old now...and some more seeds recently sown, I've got lots to experiment with. I'vw already cut the uppermost growing set of leaves on 3 of mine in an effort to possibly force even earlier branching....now have to wait and see what they do....

Mike in MN

I also agree with Chrisware, cut between 2 & 3.
Marie

Thanks everyone for helping me. Chrisware, just saw your post "Adenium Haicut" and the picture, which is very helpful. Plan to give mine a haircut today. Again - really appreciate the help.

I just purchased this adenium and plan to prune about 3 in above the branch point. Does this seem reasonable, I live in scottsdale az so I assume it is not too late to do this.
Thank you