Akadama Premium Bonsai Soil from BonsaiOutlet Akadama is a premium bonsai soil used by Japanese master gardeners. Akadama soil is mined in Japan from volcanic soil. Once extracted its dried and sifted to various grain sizes. Provides excellent drainage and aeration for healthy root growth. Has the ability to absorb water while spreading nutrients to your Bonsai trees roots. Akadama soil changes color (it darkens) when wet which provides a visual indicator of when to water your plant. Lots of our customers use Akadama soil for their Conifers and Deciduous trees, but it's also recommend for novice gardeners. Direct from BonsaiOutlet.com, the Internet's largest Bonsai retailer, Money-Back Satisfaction Guarantee.