The present invention provides as alternatives to natural soil (1) a plant growable artificial soil only by supplying water (such as tap-water), which has excellent fertilizer retainability by comprising a granulated material of fertilizer retainable fillers, and a method of making the artificial soil； (2) an artificial soil, which only specified fertilizer components are adsorbed by using a material having high fertilizer retainability； and (3) a granulated plant growing material having excellent fertilizer retainability so as to have both high cation exchange capacity and anion exchange capacity, excellent water retaining capacity with respect to water, which can be easily absorbed by the plants, and excellent breathability so as to return to high breathable state in a short time even if retaining water until reaching a saturated state.
