I was thinking of mixing some soil, pumice, kanuma and maybe some vulcanic rock. Akadama is an andisol (andosols) or andic soil. Here is three different grades of Akadama soil. We provide Akadama soil, Kanuma soil, Kiryu sand, pumice stone(for Bonsai). A lot of our experienced customers use Akadama soil for their conifers and deciduous trees, … It is very stable and will last for about 2 years. 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. Since establishing this company, we are dedicated to working hard to mine, produce, and sell high-quality soil products which always satisfy our customers. 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 What could be the consequences? Akadama (brown) is slightly acidic, Kanuma (yellow) - more. Akadama soil is mined in Japan from volcanic soil. Our company takes full advantage of our 48 year track records and experience as a gardening soil company in Kanuma, Tochigi prefecture. It's for Ficus Microcarpa and Myrsine trees. Double Red Line brand of Akadama is the most well known brand. I use two part Akadama/Kanuma, one part volcanic cinder, one part adsorbent and one part pine fir. I've been using Akadama (and Kanuma for Azaleas) as a mix for a while now. Is it fine to use kanuma instead of akadama in my soil mix? Akadama is the ideal soil component for bonsai. Also, with the adsorbent it really holds a lot of moisture and when it evaporates it goes into the roots. 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 I know that kanuma has higher acidity than akadama. Even akadama is hard to get. Apparently in Japan it's beeing used a lot for mesembs, too. As the roots colonize the pot they grow into the akadama and that extra moisture retention from the broken down akadama is a good thing. Akadama does break down, but it's not exactly the terrible thing that it's made out to be. I find with this combination I have really good drainage. Both Akadama and Kanuma substrates are mostly used for bonsai in these parts of the world. Kanuma is less widely available in North America than akadama. They will grow fine in akadama, they will grow fine in Kanuma, they will grow well in pumice they grow well in bark mixes. Seramis – Is orange fired clay that is similar to Akadama and Kanuma. 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