I decided to try the method with a wooden box — boards connected with nails. The flat and fairly wide shape should theoretically speed up the development of a “pancake-style” nebari in the long term.

Now it’s just a matter of watering and fertilizing; the tree will be allowed to grow freely without any pruning so it can build up as much mass as possible.

I may also make an additional (backup) air-layer, since this is the only Shin Deshojo I own.