Kanuma is a granular Japanese Potting Medium for Ericaceous (Acid Loving) Bonsai.
This particular material comes from the Kanuma Area of Japan which is basically the center of Azalea Bonsai Growing.
Again, you must understand as with Akadama, that this is the stuff that the Japanese have out in their back yards ... it's their "dirt."
It's PH varies from 4.5 to 5.
Both Akadama and Kanuma simplify the repotting chores since roots are fibrous rather than hard.
This material is dug out from 10 feet down, allowed to dry, crushed, and then sorted as to grain sizes.
It is more acidic than Akadama, and therefore, used mainly for Azaleas, Camellias, Gardenias, and other acid-loving Bonsai.
 
Note: All 1 litre packs have been sifted before repacking into a clear ziplock bag.