Here is three different grades of Akadama soil. Kanuma is less widely available in North America than akadama. Plus akadama's ability for the roots to grow through means that more of the space in the pot is available for root growth. The trees are inside. I know that kanuma has higher acidity than akadama. I use two part Akadama/Kanuma, one part volcanic cinder, one part adsorbent and one part pine fir. It's for Ficus Microcarpa and Myrsine trees. Once extracted its dried and sifted to various grain sizes. Our company takes full advantage of our 48 year track records and experience as a gardening soil company in Kanuma, Tochigi prefecture. Spruce are not that fussy about soil. Purists in the art of bonsai will tell you that growing trees in kanuma and akadama is the only way to go and that if you are not using this product, you are not really doing right by your trees. Alpine wild plants: Kanuma soil 4, Kiryu sand 3, Pumice 3 Montane wild plants: Akadama soil 3, Kanuma soil 3, Kiryu sand 2, Pumice 2 Wild meadow plants: Akadama soil 5, Kanuma soil 2, Kiryu sand 2, Pumice 1 Seramis – Is orange fired clay that is similar to Akadama and Kanuma. Akadama does break down, but it's not exactly the terrible thing that it's made out to be. I've been using Akadama (and Kanuma for Azaleas) as a mix for a while now. Also, with the adsorbent it really holds a lot of moisture and when it evaporates it goes into the roots. Akadama (brown) is slightly acidic, Kanuma (yellow) - more. Since establishing this company, we are dedicated to working hard to mine, produce, and sell high-quality soil products which always satisfy our customers. Each particle has a lot of small holes that retain a lot of moister. Akadama is the ideal soil component for bonsai. They will grow fine in akadama, they will grow fine in Kanuma, they will grow well in pumice they grow well in bark mixes. What could be the consequences? Akadama is an andisol (andosols) or andic soil. I was thinking of mixing some soil, pumice, kanuma and maybe some vulcanic rock. Akadama 3 bags for 23.99 — Regular price $23.99 Pumice 3 bags at 23.99 — Regular price $23.99 Kanuma — Regular price $8.99 It is very stable and will last for about 2 years. I find with this combination I have really good drainage. We provide Akadama soil, Kanuma soil, Kiryu sand, pumice stone(for Bonsai). Apparently in Japan it's beeing used a lot for mesembs, too. Is it fine to use kanuma instead of akadama in my soil mix? The qualities of both substrates seem to be similar to pumice. Most will use akadama as it is slightly easier to get and slightly cheaper too. Even akadama is hard to get. Both Akadama and Kanuma substrates are mostly used for bonsai in these parts of the world. 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