Rick, I use this soil mix for my seedlings and young trees. I up-pot my young trees every 5 to 8 months or so as needed. With the exception of my 32-yr-old adenium and grafted trees, all my other adeniums are seed-grown and are 2 yrs. old and younger.
My goal is to push caudex growth of my trees while they are young and growing fast. When they reach the shape and form I want and/or growth slows (around 5 yrs. old) then I will switch to a grittier mix so that I would not have to re-pot often to refresh soil.
From 8" panterra bowl
To 10" bulb pot