The trees are inside. I've been using Akadama (and Kanuma for Azaleas) as a mix for a while now. 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. Akadama soil is mined in Japan from volcanic soil. A lot of our experienced customers use Akadama soil for their conifers and deciduous trees, … Spruce are not that fussy about soil. Each particle has a lot of small holes that retain a lot of moister. Most will use akadama as it is slightly easier to get and slightly cheaper too. Double Red Line brand of Akadama is the most well known brand. The qualities of both substrates seem to be similar to pumice. 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. I find with this combination I have really good drainage. Since establishing this company, we are dedicated to working hard to mine, produce, and sell high-quality soil products which always satisfy our customers. Both Akadama and Kanuma substrates are mostly used for bonsai in these parts of the world. What could be the consequences? Plus akadama's ability for the roots to grow through means that more of the space in the pot is available for root growth. Our company takes full advantage of our 48 year track records and experience as a gardening soil company in Kanuma, Tochigi prefecture. Once extracted its dried and sifted to various grain sizes. Akadama is an andisol (andosols) or andic soil. 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 (brown) is slightly acidic, Kanuma (yellow) - more. We provide Akadama soil, Kanuma soil, Kiryu sand, pumice stone(for Bonsai). Even akadama is hard to get. Kanuma is less widely available in North America than akadama. Seramis – Is orange fired clay that is similar to Akadama and Kanuma. Also, with the adsorbent it really holds a lot of moisture and when it evaporates it goes into the roots. Is it fine to use kanuma instead of akadama in my soil mix? I know that kanuma has higher acidity than akadama. Akadama does break down, but it's not exactly the terrible thing that it's made out to be. Akadama is the ideal soil component for bonsai. I use two part Akadama/Kanuma, one part volcanic cinder, one part adsorbent and one part pine fir. Here is three different grades of Akadama soil. 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. Apparently in Japan it's beeing used a lot for mesembs, too. They will grow fine in akadama, they will grow fine in Kanuma, they will grow well in pumice they grow well in bark mixes. 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