屋おく上じょう緑りょく化かMeaningsNoun1. rooftop gardening; rooftop planting; roof greeningKanji used屋roof上above緑green化transformationComposed of屋おく上じょうrooftopNoun緑りょく化かgreening (i.e. planting to increase greenery); tree planting; afforestationNoun