Green Sky in Singapore, Comcrop 'Urban Farming' by the Living Project
Compared to other urban farming projects, Comcrop (born in 2013) is still a baby.
Yet it proves that even in densely populated cities, Singapore ranked 3rd in most crowded places after Macau and Monaco and before Hong Kong (according to Wikipedia piece), there is room to grow.
Green sky in Singapore for Green Day # 271
(* Comcrop image from Comcrop Facebook page)