Will this false cypress survive

[qwerty Bonsai]

Repotted about a year ago, from nursery stock, soil used was bonsia jack premixed soil, but kept quite big part of the original soil/root ball

It's slowly turning yellow - is it normal or if it's dying? Any suggestion how to rescue?

Thanks!

 

[Mike Westervelt]

Hard to tell, but looks like its just shedding old foliage, is there any yellow/brown areas at the ends of branches or is at all behind green healthy growth?

 

[qwerty Bonsai]

Started from those behind green growth, but now seems all over the place.

It's on a deck outside, even during the cold days during Christmas when temperature really dropped to lower teens.

 

[Leo in N E Illinois]

I winter my hinoki just setting on the ground in the north burbs of Chicago, a much more severe climate than yours. Winter is not the cause of your problem.

Most likely the problem is you kept too much of the old soil when you repotted. Now you have a pot where the media is not uniform. The new media is likely drying out and the old is staying too wet. This is my guess. I would check roots, maybe bare root and repot into fresh media in spring if you agree with my conjecture.

 

[qwerty Bonsai]

I winter my hinoki just setting on the ground in the north burbs of Chicago, a much more severe climate than yours. Winter is not the cause of your problem.

Most likely the problem is you kept too much of the old soil when you repotted. Now you have a pot where the media is not uniform. The new media is likely drying out and the old is staying too wet. This is my guess. I would check roots, maybe bare root and repot into fresh media in spring if you agree with my conjecture.

Thank you, I suspect that is the problem as well.
With the tree's health status like this, bare root it/wash the root, seems a big risk, but if not do it, seems a certain death....

 

[Wires_Guy_wires]

You can always half bare root it in spring, and do the next half bare root the next year.

 

[qwerty Bonsai]

You can always half bare root it in spring, and do the next half bare root the next year.

got it，thank you.