you could add some fish to your water reclamation tank for a small aquaponics system. Grow a few plants to feed the fish and this forms a closed system. There is no need to fertilize, the fish do it for you! Permaculture at its finest!
Patio Decor and Gardening / urban gardens, small space manipulation. No instructions, but good inspiration for taking a very narrow and challenging space and turning it into a tiered garden with vertical elements.