PROBLEM TO BE SOLVED: To provide a system for greening a non-soil slope for a long period by a relatively simple method of improving the water retaining property in a steep sloped place of the non-soil slope.SOLUTION: The system for greening the non-soil slope includes: a step for planting and curing a plant in a cylindrical container containing a mixture of water-absorbent resin, plant growing carrier and water； a step for forming a hole of at least such a size and depth as to hold the cylindrical container on the non-soil slope； and a step for inserting the cylindrical container into the hole with the planted plant as it is or after taking out the mixture with the planted plant from the cylindrical container. In the water absorbent resin, the electrical conductivity of water-containing gel when 100 pts.wt. of ion-exchange water at the temperature of 25°C is absorbed in 1 pt.wt. of the water absorbent resin is 0-2.0 ms/cm, and the water absorbency multiplying factor of ion-exchange water at the temperature of 25°C is 80-1000.
