(Footnote to my comment above.)
When "pushed" (given lots of rainwater, nutrients, an organic-rich soil with microbial activity, aeration, light, and warmth), adeniums will grow fast within the first 3 to 5 years. After that, their growth slows.
My goal is to grow a fat caudex early on, then when mature and growth slows down my potting media will be switched to a bonsai media to maintain form.
Although it is not even a year old yet, this obesum, in an 8” bowl, could be switched to bonsai media now to restrict its growth, but I’ll wait. It had been subjected to root cropping and several up-pottings that flowering was delayed. Really want to see the flowers on this one.