Spruce are not that fussy about soil. Both Akadama and Kanuma substrates are mostly used for bonsai in these parts of the world. Even akadama is hard to get. Akadama is an andisol (andosols) or andic soil. It's for Ficus Microcarpa and Myrsine trees. Most will use akadama as it is slightly easier to get and slightly cheaper 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. I've been using Akadama (and Kanuma for Azaleas) as a mix for a while now. Plus akadama's ability for the roots to grow through means that more of the space in the pot is available for root growth. Double Red Line brand of Akadama is the most well known brand. 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 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. The trees are inside. Since establishing this company, we are dedicated to working hard to mine, produce, and sell high-quality soil products which always satisfy our customers. 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? A lot of our experienced customers use Akadama soil for their conifers and deciduous 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 What could be the consequences? 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 use two part Akadama/Kanuma, one part volcanic cinder, one part adsorbent and one part pine fir. Each particle has a lot of small holes that retain a lot of moister. I was thinking of mixing some soil, pumice, kanuma and maybe some vulcanic rock. I know that kanuma has higher acidity than akadama. Akadama (brown) is slightly acidic, Kanuma (yellow) - more. Akadama soil is mined in Japan from volcanic soil. Once extracted its dried and sifted to various grain sizes. The qualities of both substrates seem to be similar to pumice. We provide Akadama soil, Kanuma soil, Kiryu sand, pumice stone(for Bonsai). It is very stable and will last for about 2 years. I find with this combination I have really good drainage. Here is three different grades of Akadama soil. 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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