BUILDING GREENING SYSTEM

PROBLEM TO BE SOLVED: To provide a building greening system without outflow of water and a culture solution for greening plant cultivation to a rooftop face or a wall face of a building while preventing the durability of the rooftop face or the wall face of the building from lowering.SOLUTION: When each spray nozzle 2F of a spray device 2 sprays mist of the culture solution for greening plant P to a space between a rooftop face R of a factory and a planting floor 1 of the greening plant P, the mist of the culture solution directly is absorbed from the root hair of the planted greening plant P in the planting floor 1. Accordingly, the greening plant P is cultivated, so that the rooftop face R of the factory is greened.