Soil-Climbing Hydrangea anomala petiolaris

Anyone know what soil mix for Climbing Hydrangea? I have seen several nice ones including Bill Valavanis, Rocky Mountain Bonsai Society and one from the collection at the Pacific Bonsai Museum. I was not able to find anything about soil. I have a decent peegee hydrangea thats coming along in 100% akadama but this was more of an experiment.

Curious if anyone on here knows anything on the soil any of these well developed trees are in?

Hydrangeas love water, so 100% akadama is a good place to start.

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