<；P>；PROBLEM TO BE SOLVED: To provide a light-weight greening device installable on the roof of an existing construction. <；P>；SOLUTION: A roof greening device 10 includes a medium 14 attached to the top of a slate roof 12 and composed of e.g. PVC pipes 30 having openings 28 for planting a Hedera helix 19, a frame material 16 laid on the roof for extending a plant from the medium 14 along the slate roof 12, and a circulation system 20 comprising a water-supplying pipe 22, a water discharging pipe 24, and a liquid fertilizer tank 26, for circulating a liquid fertilizer 18 supplied to the medium 14. <；P>；COPYRIGHT: (C)2009,JPO&INPIT
