Air layer help. Where ...?

I was gonna put it in a grow box to allow the roots to grow horizontally. Don’t want it becoming root bound. I’ve had this tree for about 3 months and haven’t touched it yet. I figured now would be the best time to take the next step.
Root bound and horizontal roots, two very different things. I would guess your tree is not root bound, do you think it is? Why?
 
No it’s not root bound yet. I pick it up out of the pot and it’s not completely full yet. But I do recognize it has very long internodes. So I was even considering a trunk chop but thought an air layer would be more resourceful. And then I was thinking I need to put in grow box before I do that. This is all new to me. Have never air layered anything
 
Maybe A. palmatum Bihou or Miya

It looks a lot like my 'Bihou' (several spellings). If it is, it is said to be rather temperamental by maples enthusiasts. Fungal infections, die-back after pruning, etc.

Among about a dozen people, I'm one of the few that have been able to keep it for several years so I think that on its own roots it would be even more fragile. Some maple cultivars can live on their own roots for a couple of years and then suddenly die so I would think twice before you air-layer-it.

Since a cutting and an air-layer are both "clones", I would try summer cuttings first: if they take, and survive, maybe air-layering could be an option.

But I wouldn't be too optimistic.

acerp-bihoo_191227a.jpg

acerp-bihoo_200319a.jpg
 
Those internodes are pretty long to be thinking of air layering.
I always chose closer i-nodes.
 
So what about a trunk chop? Would like one bonsai our of the tree
 
So what about a trunk chop? Would like one bonsai our of the tree
If you want to keep the cultivar....which you probably do, considering you bought it....keep it in its nursery pot, try a couple air layers this year....then later on, after it beefs up and you've long since separated your layers, you can chop back to below the graft, and probably have yourself a normal green maple.
 
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