Burning soil is a kind of soil specially used for assembling orchids. There are three kinds of soil: large, medium and small. The particles are hollow and the pores on the surface are round. Therefore, it has good water absorption and water retention performance, and will not stab the roots of orchids like broken bricks. In addition, the burnt soil is clean and hygienic, and it will not be broken after being poured into the basin for a long time, which greatly improves the ventilation conditions in the basin and creates a suitable growth environment for orchids.