Farming Potential in Urban Areas

Imagine waking up in a downtown apartment to the busy sounds of morning with a hankering for fresh fruit. The last thing you want to do is fight rush hour traffic to get to the grocery store, so you throw on a robe and march up to the roof where your garden is in full bloom. After picking some ripe strawberries you head back downstairs to add them to a bowl of Cheerios and start the day. Sound far-fetched? Actually, rooftop gardening has been around for millennia, with roots dating back to ancient Mesopotamia more than 7,000 years ago. Today, as the density of urban centers increases, available space for gardening is becoming increasingly scarce. To help reduce the size of a city’s ecological footprint (a measure of human demand on Earth’s ecosystems), as well as provide aesthetic and architectural benefits, many urban planners believe that urban agriculture can be an effective tool.

There are two kinds of rooftop gardening: green roofs and rooftop gardens. Whereas rooftop gardens act much like backyard gardens, with walkways and furniture, green roofs are almost entirely covered with vegetation. Perhaps most importantly, “green roofs” can potentially lead to substantial energy savings by reducing the need for air conditioning. According to a study at the University of Cardiff in the UK, green roofs and walls can reduce local temperatures by up to 11.3°C, depending on the city. How, you might ask? Hot surfaces, such as concrete, metal, and asphalt, which make up most urban structures, warm the surrounding air and create “urban heat islands.” Because green surfaces absorb less heat from the sun, these surfaces, and consequently, the surrounding air, are cooled. In addition, plants, through a process known as evapotranspiration, cool the air by evaporating water. Thus, green roofs act as a kind of insulation.

Rooftop gardens, on the other hand, provide a local source of food, which lessens reliance on trucking in food from distant farms. If every apartment building in a downtown area had its own garden, imagine the potential for energy conservation and community development, not to mention a cheap source of fresh food. Many have recreational areas, furniture, hammocks and even trees, adding organic aesthetic beauty to an otherwise inorganic environment. Rooftop gardens also help urban denizens maintain a connection to nature that can be difficult to maintain when surrounded by miles of concrete and asphalt.

Many cities now have their own urban agriculture organizations, dedicated to furthering the goals of sustainability and providing resources for residents interested in starting their own urban garden. Some helpful starting points for anyone interested in urban gardening include the Resource Centers on Urban Agriculture and Food Security (RUAF) Foundation, cityfarmer.org, and urbangardenmagazine.com.

-Kyle Johnson