Jisho

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Noun
1. rooftop gardening; rooftop planting; roof greening
Wikipedia definition
2. Green roofA green roof or living roof is a roof of a building that is partially or completely covered with vegetation and a growing medium, planted over a waterproofing membrane. It may also include additional layers such as a root barrier and drainage and irrigation systems. (The word "green" refers to environmentalism and not the color green, as with green roof tiles or roof shingles).
Read “Green roof” on English Wikipedia
Read “屋上緑化” on Japanese Wikipedia
Read “Green roof” on DBpedia

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