I was curious if anyone as ever split the trunk vertically to thicken it? I've seen some videos on it, but never the stages in healing or the end results. Would it thicken enough to be worth it?

I have already done this with a tree I'm training, it's been over a month and the tree is still healthy but still has a hole up and down the middle of the trunk, I'm not even sure that it's closed up at all yet.

I'm interested to know other peoples experience in this.

I've seen it to help making spread nebari.

I would not recommend this. You effectively create a permanent hole in the wood. Plants do NOT heal wounds. They may coover them up. But the damage stays and remains a potential point of infections etc Better just let the plant grow healthily.

Alright. Thanks guys!