I purchased this silver birch from a closing down nursery for 10 bucks. I'm not sure if it is usable for bonsai at all.
I've attempted an air layer on one of the branches that I would any way cut off for a bit of an experiment. I'm new to bonsai by the way.
Any thoughts on the best way to progress this tree into something that resembles bonsai?

Many thanks
Andy
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