I recently went to a bonsai store and my wife picked up a juniper. So far I have just been watering and watching it. Any recommendations on how to further refine this tree?
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The first step is to learn how to care for the tree and keep it outside.
As for a plan forward I would airlayer the tree trunk at the first bend next spring. This will remove the straight section and inverse taper giving the tree a better look and much more powerful base.
I agree the lower right branch needs to go, but i would keep it for the time being to provide extra strength for the air layer. It can be removed at any time. Once the tree is reestablished on its own roots. ( after the air layer) then the design work can begin. At this point you should learn how to thin foliage, wire branch and pad structure for future shape.
Junipers air layer very easily and the improved nebari will be another improvement for the tree. Three for the price of one simple technique!
Straight section gone, inverse taper gone, nebari improved.
If you are looking for some helpful literature i would suggest " Junipers"
Growing and Styling Juniper Bonsai available online through Stone Lantern.