Xochimilco Chinampas: Canal Farming and Living Soil

The water in the canals of Xochimilco does not just reflect the sky; it supports life. Here, in the southern basin of Mexico City, agriculture happens on raised fields surrounded by canals, known as chinampas. Built up from lake sediment, branches, and decaying vegetation, their edges are secured with stakes and trees. They are fixed agricultural plots, not floating rafts.^[1]^[6] For over a millennium, this system has provided food and ecological stability to the region. Yet today, the survival of this heritage faces a complex set of pressures: soil degradation, generational gaps, and the economic challenges of competing with industrial agriculture. To understand how Xochimilco continues to function, we must look beyond the romantic image of a ride in a trajinera, a canal boat carrying passengers and examine the physical, social, and economic mechanisms that keep these islands alive.

A Heritage of Resilience

The chinampa system is an articulated network of wetland raised fields. The Food and Agriculture Organization of the United Nations (FAO) designated it a Globally Important Agricultural Heritage System (GIAHS) in 2017, recognizing its historical depth and ecological sophistication. This is not merely a historical vestige. It is an active agricultural system that has adapted to constraints on the movement and availability of water and the high food demand of a major metropolis.

Tomasa at a chinampa she helps cultivate. Photo: Frigoletti / CC BY 4.0.

The productivity of the chinampas relies on biological stability. Farmers use sophisticated methods, including multiple cropping and crop shifts, to maintain yield without depleting the soil. The system supports a remarkable diversity of life. Local producers manage 51 domesticated species, while the surrounding environment hosts 96 non-domesticated species. These wild plants serve critical functions: 67% are used as fodder, 20% for medicinal purposes, and 13% for food. This biodiversity extends to the water itself. The canals and small ponds support aquatic communities that provide habitat for birds and small animals. The chinampa is, therefore, both a farm and a wetland, a dual identity that defines its ecological value.

Healing the Soil

Despite its historical resilience, the soil in Xochimilco faces specific threats. UNAM’s December 3, 2025 report follows growers learning to diagnose conditions on their own plots. In Xochimilco, salinity, the buildup of salts in soil, is identified as a primary problem affecting productivity. This is where the Global Soil Doctor Program enters the picture. Promoted nationally by the National Autonomous University of Mexico (UNAM), through its interdisciplinary soil-studies program, Programa Universitario de Estudios Interdisciplinarios del Suelo (PUEIS) since 2021, the program trains farmers to diagnose the health of their own land.

Women caring for chinampas in Xochimilco. Photo: Frigoletti / CC0.

The training is practical and low-cost. Participants learn to excavate a one-meter square pit to analyze soil horizons, the layers beneath the surface, as well as texture, acidity or alkalinity measured as pH, and organic matter. It is described as a clinical chart for the earth. Lourdes Fuentes Martínez and Macrina Dehesa Sánchez, two certified "Soil Doctors," illustrate the impact of this knowledge. Macri, who inherited her plot from her father, notes that when she started, the land was completely infertile. After applying the diagnostic techniques and sustainable management practices, she reports that seeds now sprout spontaneously. For Lourdes, the soil training also opened a way to share what she learned with others. UNAM’s December 2025 report counted these two farmers and 681 others certified across 16 states, creating a network of local experts capable of maintaining the biological integrity of the chinampas.

The Axolotl as a Metric of Health

The health of the chinampa is inextricably linked to the health of the water. The axolotl, an aquatic salamander (Ambystoma mexicanum) serves as a biological indicator for this ecosystem. Linked to Mexican culture for over 1,500 years, the axolotl requires clean, oxygenated water to survive. The Adoptaxolotl campaign, led by the UNAM’s Laboratory of Ecological Restoration, uses the preservation of this species as a central goal. The university's account described a captive colony of approximately 120 axolotls at the time of reporting and efforts to improve canal conditions ahead of a possible return to the wild.

This is not just a conservation effort; it is an economic and social intervention. The campaign aims to provide financial support to chinamperos, the growers who work these raised fields, so they can continue their traditional work and rehabilitate secondary canals. The cited campaign report counted 21 chinamperos receiving financing and accompaniment at that time. Luis Zambrano González, a researcher at the Institute of Biology, argues that the survival of the axolotl depends on the entire community, not just the farmers. He calls for a collective responsibility: consuming local produce, supporting the campaign, and respecting the site as a fundamental space for agricultural production and urban resilience. The "chinampa refugio" initiative proposes establishing specific plots that are free of agrochemicals, serving as safe havens for the amphibians. This approach links ecological restoration directly to the livelihoods of the growers, creating a feedback loop where economic support enables environmental care.

Bridging the Urban-Rural Divide

For the chinampa system to remain economically viable, it must connect with the urban market. Arca Tierra, a project based in Xochimilco, has developed a model that bridges this gap. Led by Lucio Usobiaga, the organization connects rural producers with urban consumers through regenerative agriculture and fair trade. They offer over 200 varieties of food, including vegetables, flowers, and native maize, or corn, products.

Arca Tierra’s approach is distinct because it values the knowledge of the farmer as the primary asset. They use "chapines," which are described as "micro versions of the chinampa," to germinate seeds manually. This technique avoids the use of plastic trays and synthetic substrates, aligning with the principles of the ancestral system. By selling directly to households and restaurants in Mexico City, Arca Tierra creates a market for high-quality, locally produced food. This economic linkage is crucial. As Zambrano notes, the chinamperos must survive the "hecatombe," or devastation, caused by modern industrial agriculture. Providing a premium market for their produce offers a pathway to economic stability that does not rely on state subsidies alone.

Reclaiming Space and Identity

The social fabric of Xochimilco is also undergoing transformation. The Escuela Campesina, a training school for farmers, launched in March 2023 by the Iniciativa Agroecológica Xochimilco (IAX) and Arca Tierra, aims to train the next generation of farmers. The first generation consisted of five students, four of whom were women. This demographic shift is significant. The reported local account describes a belief that women should not work the chinampa soil. The land was personified as a jealous woman, and it was believed that if a woman touched the soil, it would become salty and the crop would fail.

Virginia "Vero" Martínez Guevara, a 47-year-old producer and student, recounts how this norm was a barrier to her participation. She faced harassment and exclusion for years. "It was very difficult," she recalls. "Phrases like 'you are old, what are you doing here' were bread and butter." The Escuela Campesina has challenged these norms. By providing a structured environment for learning agroecological techniques and preserving chinampa culture, the program has created a space where women can develop their skills and be valued. Vero notes that she now feels safe and appreciated, part of a team that shares knowledge. This social restructuring is essential for the future of the system. If the knowledge is not passed to the next generation, and if half the population is excluded from the labor force, the chinampa system will fade.

Conclusion

The chinampas of Xochimilco are not a museum. They are a living system that requires active management, economic support, and social inclusion. The designation as a GIAHS recognizes its past, but its future depends on present-day actions. The reports describe soil training, habitat work, market connections and farmer teaching. Their intended benefits require separate evaluation; activity and participant testimony alone do not demonstrate every ecological or economic outcome. Together, these efforts address the physical, social, and economic conditions necessary for a distinctive culture to continue in a place. The challenge is to maintain this balance in a rapidly urbanizing city, ensuring that the chinampas remain a source of food, identity, and ecological resilience for Mexico City.

What each intervention can actually demonstrate

Several initiatives connect ecological repair with a grower's working life. Their aims can reinforce one another without making every reported activity a measured success. The distinction is especially important when translating national statistics or combining reports from different years.

What each intervention can actually demonstrate
Intervention	Reported mechanism	Evidence still needed
Soil Doctor training	Growers learn to describe soil and identify local limitations.	Repeated measurements showing changes on the same plots. ^[2]
Chinampa refuges and axolotl work	Support for growers is linked to canal and habitat care.	Dated water, habitat and wild-population outcomes. ^[3]
Direct sales and farmer training	Markets and teaching may help a grower continue working.	Comparable income, retention and access evidence. ^[4]

Read the program counts as snapshots attached to their sources, not a live dashboard. National land-degradation indicators cannot serve as measurements of a particular chinampa. The mechanism worth following is local: which action changes which condition, who can maintain it, and how the result is checked. A fixed raised field, its surrounding canal and the grower's livelihood need related but different forms of evidence.