Urban agriculture

Urban agriculture is the practice of cultivating, processing, and distributing food within urban areas.

This field covers many activities beyond simple vegetable gardening. It includes animal husbandry, which is the raising of livestock. It also involves aquaculture, the farming of aquatic organisms like fish. Beekeeping and horticulture, the art of garden cultivation, are also key components. This practice differs from peri-urban agriculture, which occurs in rural areas near the edges of suburbs. Urban farming helps reduce food miles. This means food travels shorter distances to reach consumers. Shorter travel distances can lower greenhouse gas emissions. This helps in climate change mitigation, which is the effort to reduce global warming.

Practicing urban agriculture requires careful management of the environment. One major challenge is legacy soil contamination. This refers to old pollution left in the ground. Many urban soils contain lead or other heavy metals. These substances can pose risks to human health and food safety. Therefore, farmers must address these contaminants to grow safe food.

Some people use rooftop gardens to find more space.

Others use community gardens to provide food for those in need. These spaces allow people to learn about horticulture through trial and error. In Bristol, the Severn Project provides 34 tons of produce every year. This project also helps people from disadvantaged backgrounds find work.

There are distinct types of urban agricultural sites. The two main categories are gardens and farms. The USDA defines a farm as any place producing $1,000 or more in agricultural products annually. In Europe, people often use the term "city farm" for these spaces.

Gardens are often used for recreation, education, and community building. School gardens are a specific type used to teach students about agriculture. These programs began in the 1890s in Massachusetts. They aim to improve the health and education of young people.

Other sites focus on permaculture, which is a way of farming that mimics natural ecosystems.

History shows that urban farming has existed for thousands of years.

In Mesopotamia, farmers used small plots inside city walls around 3500 BC. In Persia, aqueducts carried mountain water to support desert towns. The famous Hanging Gardens of Babylon are a legendary example from this region. In China, the city of Xi'an has practiced urban agriculture for at least 5,000 years. The Incas at Machu Picchu used stepped architecture to conserve water.

The Aztecs used chinampas, which are lake-based garden plots, to grow food in Mexico. In the Americas, the Pueblo cultures used mesa agricultural plots in the Four Corners region.

Urban agriculture has often served as a tool during economic crises. In the 1890s, Detroit faced a severe economic depression. Mayor Hazen S. Pingree created "Pingree's Potato Patches" to help citizens. These were makeshift gardens used to produce food and income. During World War One, food production became a matter of national security. The United States launched the National War Garden Committee. They used patriotic messages like "Sow the Seeds of Victory." By 1919, there were 5 million victory garden plots in the US. These plots harvested over 500 million pounds of produce.

During the Great Depression, subsistence gardens provided jobs and food. These gardens produced over $2.8 million worth of food for those in need. This helped boost economic growth and spirits during harsh times. During World War Two, the National Victory Garden Program was established. These gardens were called the "first line of defense" for the country. About 5.5 million Americans participated in this movement. They grew over nine million pounds of produce each year. This accounted for 44% of all US-grown produce during the war.

Modern urban agriculture is driven by many different social motivations. Some practitioners belong to the "locavore" movement. Locavores seek to eat food grown locally to support their community. Others focus on social justice or the preservation of immigrant cultures. For example, Hmong American communities use agriculture to maintain cultural ties. Some groups focus on sustainable food networks to help the environment. Others join local food movements to respond to globalization.

These diverse groups continue to reshape how cities function and feed themselves.