Fermented walnut shells can serve as a filtering layer for the bottom of the pot in horticultural cultivation, and can also be used as a long-lasting organic fertilizer. After fermentation and maturation, walnut shells become organic materials because they are the outer shell of oil crops and contain various nutrients. Walnut shells, after fermentation and maturation, are a very high-quality organic material that contains various nutrients and is suitable for adding nutrient soil to various flowers. Especially when planting orchids, adding some rotten walnut shells to the planting material is