Salty Thumb wrote in
:

You give the height to be about 43 cm, so if you go by the above, the
tree is about a year old and the proper depth for the current pot
should be around say 100 cm or 40". Calculations for 2 additional
years of growth are left as an exercise for the reader.

scratch that ... the ratio is 2 to 2.5, not 2-2.5 to 1. So the current
depth should be around 34 cm or a little over a foot.

In other words, start shopping for pots, learn bonsai, or tranplant
the sapling to a non-potbound location.

-- Salty