If possible I’d love to know the soil mix you used Jonas from your “Coast redwood – initial repot” (https://bonsaitonight.com/2019/02/15/coast-redwood-initial-repot/) blog.
The top dressing is Clay King (80% akadama). I forget how much akadama is in the mix below. I think I used a higher akadama mix this year, likely around 40-60%. The remainder of the mix is pumice.
I don’t have a lot of redwoods so I wanted to see how they’d do with more akadama. I used the 1 part akadama, 2 parts pumice and/or lava mix in the past which worked well, but think the trees would appreciate the extra moisture as they dry out quickly in my garden.