I would of tried to keep it smaller and bushier, kind of like bonsai, but it looks good!
Do you plan on attempting to harvest it? If so, how will you do so? It looks like you have it in a single pot with soil...you would most likely have to end up killing the tree in order to harvest roots from that.
The way I plan on growing my mimosa when I get around to it is starting it in a small, one gallon plastic pot that has most of the bottom cut out from it. The sides will also have large holes cut into them. This will then be placed into a large 25-50 gallon laundry bucket that is filled with perlite.
In theory, the roots should grow out of the first container and into the second one filled with perlite. The perlite pot can then be watered for the plant to survive. You can also then remove the first pot from the second one, and shake off the perlite from the roots in order to harvest some of them. Then it can be placed back into the pot and allowed to continue growing until next harvest.
This way the mimosa will keep living, and you will continue to have a source of goodies. All about sustainability.
Everything published by Gone-and-Back are the mad rantings and ravings of a mind who yearns to be free and thinks he knows what he is talking about. However, these are just delusions made to feel that freedom, because that freedom will never come. Any experiments done are purely figments of the imagination, and are falsified to the highest degree. Nothing should be taken seriously from a crazy mans mind.