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PURPOSE : A base material for growing plants is provided to plant trees on the slope area and to prevent the slope from collapsing. CONSTITUTION : A base material for growing plants comprises crushed woody material and soil mixture. The soil mixture is mixture of decomposed granite, coco peat, wood fiber, mushroom medium, and organic fertilizer. The base material for growing plants contains plant seeds to cultivate plant in a slope. The crushed woody material is less than 10mm, soaked in the water and dried in the air. The mixing ratio of soil mixture is 42 of granite soil to 26 of coco peat to 10 of wood fiber to 11 of mushroom medium to 11 of organic fertilizer. The mixing ratio of the crushed woody material and the soil mixture is 1 to 1.