Akadama is a clay substance from Japan used as a bonsai soil component. It has excellent cation-exchange, water retention and drainage abilities.
Quaking Aspen Bonsai Guide
400g Akadama Soil Bonsai Soil - Sukh Akadama Bonsai
Do any of you keep your trees in 100% pumice?
Bonsai Society of Portland - Scott's Branch Tips
The Patient Magic of Michael Roberts: Part III
rope dam — Bonsai Society of Portland - Scott's Branch Tips
400g Akadama Soil Bonsai Soil - Sukh Akadama Bonsai
What is the best beginner bonsai tree?
June, 2012
September 2015 – Daniel Martinez