A: Yes, this planting foam is made of biochar mud, which is an artificial porous material system that simulates the structure of natural soil aggregates. It is not simply "like soil", but a pore gradient similar to loam soil is constructed through the combination of solidified fibers and biochar particles - macropores for ventilation, mesopores for water retention, and micropores for bacterial growth. This structure allows the roots to breathe freely, prevents water accumulation, and enables stable colonization of microorganisms. Traditional planting substrates either become compacted and lose oxygen, or quickly dry and leak fertilizer, while the essence of soil sponge is to incorporate the "breathing sensation" and "implicit power" of the soil into lightweight boards. It does not rely on chemical bonding, but on the physical interlocking between fiber winding force and the surface activity of carbon particles. Therefore, it does not disperse when in contact with water and does not pulverize after wet dry cycles, making it a rare "active substrate" in three-dimensional greening.