A project aimed at promoting the growth of seedlings. The box is made of recycled paper (40 cm x 40 cm x 20 cm). The tree's root system is placed in the soil inside the paper green box. The paper box is filled with water. This paper box retains the moisture inside, preserving water for an extended period of time. Combined with mycorrhiza, it enhances root growth up to the water-retaining layer. Furthermore, the box decomposes after one year.