I have a large (~36 inch) American Elm yamadori that I pulled out of the ground six months ago. I live in Louisiana (on the edge of 8b/9a), so I have ~9 months of summer and no real winter.
The yamadori is currently in 100% pumice in a large plastic storage container. It came out of the ground with a lot of hard clay field soil still on its root ball.
When I repot into a smaller grow container, what soil mix should I use? 1:1:1 lava/pumice/akadama?
How long should I leave it in the current recovery container? Repot now? Repot this coming spring? Wait another full year?