The desert outside of Tucson is harshly lit by late afternoon sunlight, which seems to flatten everything, including the soil, shrubs, and even the air. Here, farmers have come to distrust the sky. Rain either doesn’t come at all or comes in late. The Colorado River, which was formerly regarded as an unending supply of water, now seems vulnerable. The old agricultural model—industrial irrigation, thirsty crops, never-ending pumping—may just be running out of steam, as is quietly acknowledged in conversations throughout Arizona’s farm country.
However, the Southwest is experiencing an unexpected development. The solutions that people are researching more and more are not laboratory seeds or futuristic machines. Indigenous communities used these age-old methods long before the term “climate change” was coined. It’s difficult to ignore the irony as you watch these experiments take place.
| Category | Details |
|---|---|
| Region | Southwestern United States (Arizona, Sonoran Desert, Colorado Plateau) |
| Key Communities | Tohono O’odham Nation, Navajo Nation, Hopi Tribe |
| Research Institutions | University of Arizona, Biosphere 2 |
| Notable Crops | Tepary beans, 60-day corn, White Sonora wheat |
| Core Techniques | Dry farming, rainwater harvesting, shade planting, regenerative agriculture |
| Environmental Challenge | Prolonged megadrought and declining Colorado River water supply |
| Cultural Initiative | Colorado Plateau Intertribal Farmer Knowledge Exhibit |
| Example Farm | Oatman Flats Ranch (Arizona) |
| Key Focus | Preserving heirloom seeds and Indigenous agricultural knowledge |
| Reference | https://biosphere2.org |
Vegetable rows grow under raised solar panels outside Biosphere 2’s research complex. When squash, onions, and tomatoes are shaded, their leaves are notably less stressed than those of plants that are exposed to the intense desert sun. The idea is straightforward: shade keeps soil cooler and decreases evaporation. Agrivoltaics is the term used by modern engineers to describe it. However, for centuries, indigenous farmers in the Sonoran Desert have planted crops under mesquite and paloverde trees—a remarkably similar practice.
According to Greg Barron-Gafford, a researcher at the University of Arizona who studies these systems, the objective is to adapt traditional knowledge to contemporary circumstances. Electricity is generated by the panels. Crop survival is aided by the shade. Farming in the Southwest may resemble its distant past in an odd way in the future.
Another version of this tale can be found by traveling a few hours north to Tuba City on the Navajo Nation. Elders from twelve tribes have spent years recording dry farming customs inside the Colorado Plateau Intertribal Learning Center. These methods allowed communities to grow corn and beans in one of the harshest climates in North America. The exhibit resembles a living archive of survival knowledge rather than a museum.
A few of the participating farmers speak with a quiet sense of urgency. During his lifetime, traditional Hopi farmer Leonard Selestewa has reported seeing previously unthinkable changes in rainfall, soil moisture, and wind patterns. These communities seem to be witnessing the effects of climate change in the ground beneath their feet rather than in abstract graphs.
Leaving is not an option for many tribes. Relocation, a tactic employed by previous generations dealing with drought, is essentially unfeasible due to federal reservation boundaries and the restricted surrounding land. Both the land and the people must adapt.
A resurgence of interest in Indigenous crops has resulted from this pressure. For instance, tepary beans are tiny, pale legumes that have developed to withstand the intense heat of the desert. In a way that seems almost artificial, their leaves fold slightly to shield them from sunlight during the hottest parts of the day. They have been grown for centuries by farmers in the Tohono O’odham Nation. Such natural adaptation is becoming increasingly valuable to contemporary agricultural scientists.
The transition to resilient farming is also evident on operational farms in southern Arizona. Over the past few years, Oatman Flats Ranch, a 665-acre property close to Gila Bend, has been moving away from traditional agriculture. Regenerative techniques, such as minimal tillage, rotational sheep grazing, and heritage grains like White Sonora wheat, have gradually replaced cotton fields and intensive horse operations.
You can see the difference when you walk around the property today. Once hardened by years of chemical inputs, the soil now feels darker, softer, and has more organic matter. Sunflowers, cowpeas, and mung beans are examples of cover crops that are planted in between grain rows to increase fertility and retain moisture.
Whether these farms can match the yields of industrial operations is still up for debate. Actually, they hardly ever make an effort. The approach is different: grow fewer crops but better ones that can withstand significantly less water.
That creates a risk from an economic standpoint. Heritage grains cost more to grow and require consumers willing to pay a premium. Through a Tucson community-supported agriculture initiative, the ranch’s partner company, Oatman Farms, now sells bread, bagels, and grain mixes directly to consumers. It’s still unclear if enough people will embrace that model. However, the change feels important on a cultural level.
Farming is more than just a business in many Indigenous communities; it’s a link between identity, food, and land. For years, Sterling Johnson of the Tohono O’odham Nation has taught traditional dryland farming techniques, such as collecting monsoon rains and directing water through the soil’s natural contours.
The crops look surprisingly healthy when standing in fields that receive very little irrigation. With its tiny basins, organic channels, and thoughtful planting placements, the system appears surprisingly straightforward. However, the underlying knowledge dates back thousands of years.
This rediscovery is tense as well. Quietly, some Native farmers fear that mainstream agriculture may once more exploit Indigenous knowledge without helping the communities that have preserved it. It seems reasonable to be concerned.
However, the larger movement that is currently taking place throughout Arizona—from university experiments to tribal seed banks—suggests a change in viewpoint. In a warming world, modern agriculture, which is based on enormous irrigation systems and limitless water supplies, suddenly seems vulnerable. In the meantime, there is renewed interest in North America’s oldest farming practices.
Farmers in the area have already carried out a five-thousand-year experiment in drought survival, according to Gary Nabhan, an ethnobotanist who has spent decades studying desert crops. Long before there were climate models, they experimented with tactics, modified crops, and improved systems.
Nowadays, coming up with new solutions might not be the true challenge. It might be recalling those who were already present.