PROBLEM TO BE SOLVED: To provide both a method for cultivating a plant in a sound-insulating wall in the sound-insulating wall for placing a planting pack set with a plant in a box, providing the planting pack in the lowermost stage of the sound- insulating wall, thickly growing the plant from the box to the sound-insulating wall located in an upper part, collecting water such as rainwater sticking to the sound-insulating walls and cultivating the plant and a greening panel apparatus. SOLUTION: This method for cultivating the plant in the sound-insulating wall Y is characterized by fitting and inserting a thin broad box 1 in the lowermost stage part and the sound-insulating wall Y in the upper part between supports X where the sound-insulating wall Y is mounted, providing a planting pack 2 set with the vertical surface climbing and sticking type plant in the box 1, installing each water collecting plate 4 tilted to the oblique upper side on the exterior of the box 1, collecting water sticking to the sound-insulating wall located in the upper part of the box 1 in the box 1, cultivating the plant and arranging the plant in the sound-insulating wall Y. Furthermore, the greening panel apparatus is provided.
