Self-Watering Cube Garden by admin | Jul 17, 2016 | Self Watering Cube Garden Click on the photo to see how this garden is put together. Stabilize bin on stone base Put plastic milk crates in base to create water reservoir. Cover plastic crates with landscape cloth. Add a sand base to wick the water up to the soil. Add an organic core of logs. Fill with good quality soil and add an organic mulch to protect the soil. Bin is custom cladded and painted; reservoir filled; planted and growing well. And growing... And growing some more!