<;P>;PROBLEM TO BE SOLVED: To propose a planting base capable of retaining water content fed and feeding sufficient water to whole planting soil. <;P>;SOLUTION: The planting base 1 is equipped with a water-blocking layer 11 laid on the upper surface of a structure 2, a water storage layer 12 laid on the upper surface of the water-blocking layer 11 and a planting soil layer 13 laid on the upper surface of the water storage layer 12. The water storage layer 12 is equipped with a rock wool capable of moving water to all directions by capillary phenomenon, and the water storage layer 12 is brought into contact with the planting soil layer 13 through a water-permeable sheet 14. <;P>;COPYRIGHT: (C)2009,JPO&INPIT