Hong Kong's urban farms are sprouting gardens in the sky

Rooftop Republic urban farmers harvesting vegetables grown on a rooftop farm at the top of the 150m tall Bank of America tower in Hong Kong. Photo: AFP

With their heads in the clouds and their hands in the soil, a group of office workers are busy harvesting the fruits of their labour on the roof of a Hong Kong skyscraper.

Invisible to those below, a sprawling garden of radishes, carrots and rhubarb is flourishing at the top of the 150m tall Bank of America tower, a stark and colourful contrast to the monotone shades of concrete, steel and glass of the city's financial district.