This product is composed of light stone, volcanic stone, zeolite, Maifan stone, diatomite, green zeolite, perlite and other multi meat media. It is specially added with long-term slow-release fertilizer. The particle size is moderate and contains a variety of trace elements. It has the effect of root protection and root cultivation, especially conducive to the planting and growth of multi meat plants. Rainbow stone is not only a stable culture medium, but also a good choice when organic soil cannot be used as culture medium. It contains nutrients required by plants, can maintain pH value, and can store 40% of its own volume of water. At the same time, the air flow gap is good.