The cat litter available in SE USA crumbles into dust within days if left wet. Do you have access to a type that stays intact for years?? We use turface or oil-dry which will not decompose even after 3 -5 yrs.Good info thanks. The distinction I was not making, was between yamadori and container grown. I can understand now that collected trees come from an entirerly different place and ecosystem, so to hose them would be wiping away good material they have built up over years..
For potted though, I’m going to guess it’s ok to hose, in that case..
I hope the car litter I use doesn’t act too much akadama in that it hurts to the tree after 2-3 years.. although the substrate/litter has been tested and recommended. Plus after 2-3 years I’d be looking to repot any way.