I can’t remember what Ryan has suggested as the soil mix for cryptomeria. I acquired a small nursery stock “Black Dragon” cryptomeria I will be repotting in the spring. If you have any experience to share with cryptomeria please do.
I think he’s said 3:1:1 akadama, pumice, lava. Pretty standard for him with most elongating species.
There are two streams on cryptomeria that are pretty great (nursery stock part 2 and then there was a follow up later).
I rewatched most of the nursery stock part 2 yesterday and didn’t hear it mentioned. I was thinking the standard 3:1:1 but I wanted to confirm. Thanks for the reply @nmhansen.
It’s been a while but I believe it was in the second video where it was mentioned. https://live.bonsaimirai.com/library/video/cryptomeria-design-refinement