LOUISE MURRAY / SCIENCE PHOTO LIBRARY LOUISE MURRAY / SCIENCE PHOTO LIBRARY
Underground horticulture. Pea shoots being grown in an experimental urban horticulture farm located 33 metres below the ground. The site, run by Growing Underground, is a disused tube tunnel in Clapham, London, UK. It uses coloured, energy efficient LED lighting and hydroponics (growing without soil) to produce crops throughout the year. This method of production uses 70% less water than open field farming and avoids the need for pesticides. Growing crops within an urban zone reduces 'food miles' compared to imported food crops. The seedlings are harvested at the first true leaf stage (8-10 days) when the flavours are at their most intense.
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