However the big news is that I now what kind of tree it is!
Looking closely to the image you can see few spikes on the trunk (and my finger in the right corner). When i was planting the i used a lot of different seeds at the beginning but the only tree that has spike is the Bitter Orange. That is a little bit disappointing because the fruits of this tree are not really good to eat, but the full growth tree looks great and in a second time I can try to insert a graft of a sweet orange tree to make the fruits tasty!
