Sedum Standard System by Xeroflor. Pre-vegetated mat, two layers of water retention, drainage mat and root barrier are loose laid on roofing membrane. No loose soil makes for an easy and quick installation.
vertical gardening could incorporate fish water to sustain plants & both to sustain you. Plants clean fish water returning re oxygenated & clean to sustain fish. All it requires is management as we are supposed to do with creation .