IN ground planting for less than a year is futile and potentially harmful. Trees require at least three years in the ground to even begin to benefit in terms of trunk growth. It takes at least that long for the roots to become established. Roots are the "engine" that drive top growth. Constantly moving and disturbing them slows them down cuts their efficiency. The more you do it, the more effect it has on slowing top growth. The longer it is left alone,the greater the top growth.
In ground planting in a temperate zone with a tropical species would yield absolutely nothing in that you'd have to remove the tree within four months of putting it in the ground. A larger container with quintuple the soil volume or a little larger of a typical "show" pot will yield far greater results. That container can be wheeled in an out the sun, cold or whatever, easily, while allowing alot of root run.