There are my three basic soils
Akadama You buy the size its either small - medium - or large
pumice You need to sift. into different grades
red lava You need to sift. into different grades
Now my questions:
Is there a need to micro - manage the soil culture in bonsai soils ? Such as 4.5 mm screen verses 3 mm screen? Then rebooting a medium size bonsai 12 - 16 inches high.
Would it be better for the pumice & lava to be slightly larger than the akadama for needed air space in the root zone? such as using medium size pumice & lave with small akadama?
thinking all the time