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." 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.