Akadama is a clay substance from Japan used as a bonsai soil component. It has excellent cation-exchange, water retention and drainage abilities.
400g Akadama Soil Bonsai Soil - Sukh Akadama Bonsai
My PNW Fall Foliage Wrap Up : r/Bonsai
Hard Premium Akadama Bonsai Soil (Standard Grain)
Tinyroots Akadama 2.25qt Bonsai Soil, Sifted Through
Oregon Myrtle - Umbellularia californica
Substrate, wooden boxes, pond baskets & colanders
Bonsai Portland Nursery
Bonsai Soil - Wholesale Orders - Bonsai Tonight
A 'Cliff Bonsai'—Western Hemlock Styling
O-FarFarm Bonsai Soil Mix Ready to Use 4 Quart, Fast