Comes from the mineral-rich soil of the foothills of the famous Japanese volcanoThis natural volcanic soil substrate, made of andesitic and rhyolitic tephras, is very rich in nutrients and ideal for the growth of lush plants in bioactive terrariums with plants.The porous surface contributes to outstanding drainage and aeration, at the same time supporting robust root growth. The low density and friable density of the Sub Stratum substrate promotes the proliferation of beneficial nitrifying bacteria and thus creates a self-su..