to get the most growth acers should be planted in open ground to thicken the trunk for a couple of years depending on what thickness trunk you want
I do bonsai trees and maples that I started in pots take a lot longer to thicken than in open ground in open ground ie: the garden just let it grow untouched feed in the growing season when the trunk grows to the size you what then you can dig it up and pot it on cut the main leader branches to a bit shorter than you want the final height that leaves space for new leader to grow that gives you te new crown and trim back any crossing branches and to shape it
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to get the most growth acers should be planted in open ground to thicken the trunk for a couple of years depending on what thickness trunk you want
I do bonsai trees and maples that I started in pots take a lot longer to thicken than in open ground in open ground ie: the garden just let it grow untouched feed in the growing season when the trunk grows to the size you what then you can dig it up and pot it on cut the main leader branches to a bit shorter than you want the final height that leaves space for new leader to grow that gives you te new crown and trim back any crossing branches and to shape it
how this helps
mike