The solarium is just a part of the house, Tarev. Bringing in the outdoors is simply a bonus. I have never really grown plants indoors (other than on a winterized, screen porch) so everything I do is "experimental" at this point.
Here are some of my Adeniums grown from seed. The seeds were planted July 5, 2015. I have one plant that is at least twice as large as all the rest, but I don't know why (second picture, middle plant). As you can see, I don't have any of that wonderful caudex or root formation yet, just a single, fat trunk.