"Enter aeroponics, which presented the state with an opportunity to grow food in a limited amount of space. Under this farming system, plants are cultivated with their root systems suspended in the air while a nutrient solution, circulated in mist form, maintains a constant film of nutrients and moisture on the roots. One of the world's largest aeroponic farms has been running for more than a decade in Singapore, producing cut salads and herbs for local supermarkets - perishable products that are difficult to import."
Tom Levitt,"Urban Farming," Resurgence & Ecologist, no. 280 (2013): 19