Time-Released Hydration & Superior Aeration. Stop the cycle of soil compaction and root rot. Our Professional Bonsai Soil acts as a natural "moisture battery," absorbing excess water during irrigation and slowly releasing it back to the roots as the medium dries. Because each granule is fired in a rotary kiln to become a stable ceramic, it provides a permanent solution for drainage that won't break down year after year. Use it as a stand-alone medium or blend it with your favorite mix to ensure a neutral pH and a free passage of oxygen. It’s the professional's choice for a stable, non-toxic, and low-maintenance growing environment.