Biochar sponge plug is soilless grow plug made from biochar (65%), plant fiber (20%) and sponge (15%) with rich nutrients for abundant root growth. Biochar sponge plug contains the perfect balance of water- air ratio, allowing plant roots to get sufficient water, air and nutrient. It also contains the right acidity (pH 6.0-6.5) level, which means the roots can absorb any added nutrients/fertilizers optimally and efficiently. Because biochar can increase soil fertility, conserve water and nutrient, and provide protection against some foliar and soil-borne diseases.