Leo in N E Illinois
The Professor
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Growing out in tubs is a perfectly acceptable method of developing young material into pre-bonsai, to become bonsai. Growing out in tubs is not as rapid as growing in the ground, but has the advantage that the roots are confined in a container, making for less trauma to the root system when it comes time to repot. Also growing in the tub means you don't have to lay on your belly, on the ground to get a good look at the trunk. For myself, being of rotund dimensions, this is very important. If I get down on the ground, it is a major project standing back up.
For maples, the standard landscape nursery method to propagate named cultivars of maples is buy grafting. In general, maples with graft unions, and resulting grafting scars are generally unacceptable for bonsai. So when shopping for Japanese maples, do focus your search for them with bonsai orientated nurseries which will produce the maples by cuttings or air layers. Or only purchase seed grown, no cultivar name maples.
For maples, the standard landscape nursery method to propagate named cultivars of maples is buy grafting. In general, maples with graft unions, and resulting grafting scars are generally unacceptable for bonsai. So when shopping for Japanese maples, do focus your search for them with bonsai orientated nurseries which will produce the maples by cuttings or air layers. Or only purchase seed grown, no cultivar name maples.