Growing Food Locally: Integrating Agriculture Into the Built Environment

Tremendous energy is expended transporting food from fields around to world to our tables. Large-scale, centralized food production is vulnerable to disease and other threats, and there are health benefits to more local food production. In this context, there is growing interest in producing food closer to home, even in urban areas.

There are two broad approaches to more localized food production. First, the vacant land around buildings—which comprises about 15% of urban land nationwide—can be turned into productive gardens and farmland. There are thousands of community gardens and hundreds agricultural enterprises (both nonprofit and for-profit) that are converting this unused, urban land into productive land for vegetables, fruits, and other crops. In some urban farms, isolation from contaminated soils is provided with a layer of clay.

Second, there is a tremendous amount of commercial roof area in urban and suburban locations, and some of this space is suitable for productive green roofs or rooftop greenhouses. With greenhouses, soil-based growing is practiced by some, but most growers have turned to lighter-weight hydroponics (growing in which nutrient solutions replace soil). The innovative field of aquaponics marries aquaculture (fish farming) with hydroponics to permit ecological systems in which fish waste provides the fertilizer for plant growth.

Both of these approaches offer challenges to architects and farmers alike. Finding plots on the ground that are uncontaminated and receive enough sun for vegetables can be difficult in dense urban centers, and rooftop systems can easily overload existing structural supports if not carefully planned.