Trying to save a little Shimpaku...

Bolero

Omono
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Here is a stressed and dying Shimpaku that I am trying to save.....

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Same Shimpaku sharing the brick pile with a Koto Hime.....

bonsai maples 2017 006.JPG
 
I would do both as a precautionary. Any way to offer a shade cloth? We had some exceptionally hot days there for awhile in Ohio. Could be heat...mine are all on the back patio out of the stressful heat. Not as pretty...but they are thriving well there. Health trumps displaying when we had that essesive heat last few weeks. Anyway to offer a shade cloth or relocate If your having an extremely hot day?
 
It looks like it has a tip blight, possibly spider mites, too, and the very upright pot is extremely hard on tress when it comes to root health. Lots to overcome there.
 
Here is a stressed and dying Shimpaku that I am trying to save.....

Not enough Sun and to much Water. They cannot be left to dry but can never stay wet for extended periods, especially tricky in the tall pot. It would suggest as @Dav4 said, Phomopsis Twig Blight.

For future reference I do use tall pots for Junipers when attempting similar. What I do though is usually is put in a rather long tie down wire often a foot taller then the pot. I then fill in the first 2/3rds with crushed stone or similar. Anything that adds weight for stability and drains ultra fast. I then cut a piece of plastic hobby mesh, thread the wire through, and slide it down covering the rock/stone. Plant and wire in ;)
What I am pretty certain happened is weather and damp soil/substrate caused the fungal problem. In this case Copper treatments work well IF APPLIED on a very regular schedule BUT it really needs full Sun and less water right now. Here is a pretty good article on treatment - https://www.gardeningknowhow.com/ornamental/shrubs/juniper/juniper-twig-blight-disease.htm

Grimmy
 
For future reference I do use tall pots for Junipers when attempting similar. What I do though is usually is put in a rather long tie down wire often a foot taller then the pot. I then fill in the first 2/3rds with crushed stone or similar. Anything that adds weight for stability and drains ultra fast. I then cut a piece of plastic hobby mesh, thread the wire through, and slide it down covering the rock/stone. Plant and wire in ;)

Very nice tip. Thanks for sharing!
 
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