Also, with the adsorbent it really holds a lot of moisture and when it evaporates it goes into the roots. Akadama soil is mined in Japan from volcanic soil. The qualities of both substrates seem to be similar to pumice. Plus akadama's ability for the roots to grow through means that more of the space in the pot is available for root growth. Spruce are not that fussy about soil. We provide Akadama soil, Kanuma soil, Kiryu sand, pumice stone(for Bonsai). Akadama does break down, but it's not exactly the terrible thing that it's made out to be. Each particle has a lot of small holes that retain a lot of moister. 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. A lot of our experienced customers use Akadama soil for their conifers and deciduous trees, … Is it fine to use kanuma instead of akadama in my soil mix? 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 They will grow fine in akadama, they will grow fine in Kanuma, they will grow well in pumice they grow well in bark mixes. Akadama (brown) is slightly acidic, Kanuma (yellow) - more. I find with this combination I have really good drainage. Apparently in Japan it's beeing used a lot for mesembs, too. Seramis – Is orange fired clay that is similar to Akadama and Kanuma. Since establishing this company, we are dedicated to working hard to mine, produce, and sell high-quality soil products which always satisfy our customers. 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. What could be the consequences? I've been using Akadama (and Kanuma for Azaleas) as a mix for a while now. Even akadama is hard to get. 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 Akadama is an andisol (andosols) or andic soil. I use two part Akadama/Kanuma, one part volcanic cinder, one part adsorbent and one part pine fir. Akadama is the ideal soil component for bonsai. I was thinking of mixing some soil, pumice, kanuma and maybe some vulcanic rock. It is very stable and will last for about 2 years. Once extracted its dried and sifted to various grain sizes. Most will use akadama as it is slightly easier to get and slightly cheaper too. Kanuma is less widely available in North America than akadama. Here is three different grades of Akadama soil. It's for Ficus Microcarpa and Myrsine trees. Double Red Line brand of Akadama is the most well known brand. 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