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You actually picked up on the 'potsai'. I was just writing back to @cheekah about this. It was intentional. 'Potsai' is when people try and grow cannabis and bonsai. Tried to see if anyone picked up on it but it seems you were the only one. The term I should have used is 'Shohin'. (Shohin are miniature bonsai).

Definitely never heard of the Queensland Bottle Tree. Checked it out now and it doesn't look familiar either. I'd compare it to a Baobab. Looks quite similar in a way. Going to see if I can find some seeds online.