It is repotting season down here now and I had to pull this shimpaku out to extract some feral maple seedlings. The trunk is a bit thicker than I'd usually wire so the lower bends are not as tight as I'd really like but may give you some idea of my ideas for MINIMUM bends for junipers destined for smaller bonsai.
Before bending
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After bending
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There are plenty here who would advise not to repot and bend in the same season. Maybe that's right and maybe it's just right for some climates. I don't seem to have any problems repotting and bending in a single session here, in fact I can get far better bends down low if the trunk is out of the pot. Most of the early attempts wired and bent while still potted seem to have a straight section near the ground which really stands out in a twisted trunk bonsai.
Another example from last year
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Part of a tray of twisted trunks.
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Not sure if I get better growth down here but I usually need to unwire these after around 3-4 months when the wire starts marking the trunks.
Sometimes the trunks are a bit floppy after the wire comes off but they harden up soon.
I then let them all grow for another season then wire the new growth and bend it too. Sometimes also rewire the lower section and change some bends if they don't look as good as expected. Previously bent juniper will bend far easier than same thickness that's never been bent.
Here are a few from previous years
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