Innovative government projects include Tokyo’s Suginami ward office building. In 2008 the municipal government in 2008 planted the world’s tallest “green curtain” to reduce carbon dioxide, lower energy costs, and demonstrate new green technology.
The green curtain covers the south wall of the main city offices, with support from a net nearly 29 meters in height, and a wall of vegetation consisting of fast-growing vines such as loofah, cucumber, gourd and morning glory. The vines are growing in small containers, with a moisture sensor that makes watering very efficient. During summer and fall, the offices are cooler by 4 degrees celsius.
This Tokyo ward-level project is an amazing demonstration of vertical urban gardening, but unfortunately little information is available online in English about this project.
UPDATE: There’s a fantastic 2010 blog about a Suginami resident creating a small green curtain. Wonderful photos document the progress, lots of information about plant types, and participation of 4 year old child. Very cool!