Pie in the sky: The world's first edible high-rise

Toronto scientist Gordon Graff has created plans for a 58-floor concept building - the SkyFarm - which would grow crops in the heart of the city and could provide enough food for 35,000 people every day

The potential of city-based farming could be vastly expanded if we extend upwards as well as using ground-level plots.

Of course, one major problem with growing produce on our roofs is the quantities of soil needed, which would add unfeasible amounts of weight. However, hydroponic technology – using nutrient-enriched water instead of soil – could be the solution.

Toronto scientist Gordon Graff has created plans for a 58-floor concept building – the SkyFarm – which would grow crops in the heart of the city and could provide enough food for 35,000 people every day.

Crops would be irrigated by water recycled through the building's hydroponic system and, with no soil, many diseases are ruled out – meaning no need for chemical pesticides.

Rumours abound of a similar skyscraper farm being developed in Las Vegas. It is said that the 30-storey structure would be not just about agriculture, but would house pigs too – though some have suggested the vertical pork farm could be a hoax. Punchlines on a postcard, please.

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