The potato — humble, starchy, ubiquitous — may be humanity’s best bet for feeding astronauts on the Moon and Mars. But coaxing tubers from alien soil is far harder than Matt Damon made it look.
A series of experiments published in the journal Frontiers in Astronomy and Space Sciences has demonstrated that potatoes can survive and even produce tubers in simulated lunar and Martian regolith. The catch: only with extensive human intervention, careful soil amendment, and conditions that would make any terrestrial farmer wince. The results are promising in the narrowest sense. They prove biological possibility. They also expose just how far we are from anything resembling extraterrestrial agriculture at scale.
The research, conducted by a team at the International Potato Center (CIP) in Lima, Peru, in collaboration with NASA and the University of Engineering and Technology (UTEC), subjected potato plants to conditions mimicking the soils found on the Moon and Mars. As Slashdot reported, the experiments showed that potatoes can technically grow — but “with lots of help” is the operative phrase.
Lunar regolith is nasty stuff. It’s essentially pulverized rock with no organic matter, no microbial life, and no water-retention capacity. Martian soil is slightly more forgiving in texture but carries its own hazard: perchlorates, toxic salts that are lethal to most biological systems. Neither substrate bears any meaningful resemblance to the rich, loamy earth in which potatoes have evolved to thrive over thousands of years of selective breeding.
The CIP team didn’t ship actual Moon rocks into their Lima greenhouses. Instead, they used regolith simulants — carefully engineered analogs that replicate the mineral composition and physical properties of extraterrestrial soils. For lunar conditions, they used a simulant derived from volcanic ash deposits. For Mars, a basaltic simulant matched to data from NASA’s Curiosity rover. The simulants are imperfect proxies, but they’re the best available tools for ground-based experimentation.
What the researchers found was that raw simulant, unmodified, is essentially a death sentence for potato plants. No surprise there. The breakthrough — such as it is — came when they amended the simulants with organic matter, beneficial microorganisms, and controlled nutrient solutions. With those additions, certain potato varieties managed to sprout, grow, and produce small tubers. Some varieties performed significantly better than others, suggesting that targeted breeding or genetic selection could eventually yield cultivars optimized for off-world conditions.
But the yields were dismal by any agricultural standard. Small tubers. Limited biomass. And constant monitoring of water, nutrients, and light.
This matters because space agencies are increasingly serious about in-situ resource utilization — the idea that long-duration missions to the Moon and Mars will need to produce food locally rather than hauling every calorie from Earth. NASA’s Artemis program envisions sustained human presence on the lunar surface within the next decade. Mars missions, whether led by NASA or SpaceX, would involve transit times of six to nine months each way, making resupply from Earth impractical for anything beyond emergency provisions.
The potato is an attractive candidate for several reasons. It’s calorie-dense. It provides meaningful amounts of vitamin C, potassium, and vitamin B6. It can be prepared in countless ways, which matters enormously for crew morale on missions lasting years. And unlike grain crops that require extensive processing, potatoes can be eaten almost directly after harvest. The tuber is, in a sense, a self-contained food package.
Still, growing them off-world presents challenges that go well beyond soil chemistry. Lunar days last roughly 14 Earth days, followed by 14 days of darkness. Temperature swings on the lunar surface range from 127°C in direct sunlight to -173°C in shadow. Mars offers a more Earth-like day length — about 24 hours and 37 minutes — but surface temperatures average around -60°C, and the atmosphere is 95% carbon dioxide at less than 1% of Earth’s atmospheric pressure. Any agricultural operation would need to be fully enclosed, climate-controlled, and artificially lit during dark periods.
The CIP experiments addressed some of these variables. Researchers tested potato growth under reduced atmospheric pressure and elevated CO₂ concentrations meant to approximate sealed Martian habitats. Certain varieties tolerated these conditions reasonably well. Others didn’t. The variance between cultivars was striking — a finding that points toward the importance of selecting the right genetic material before any seeds leave Earth.
Radiation is another unresolved problem. Both the Moon and Mars lack the magnetic fields and thick atmospheres that shield Earth’s surface from cosmic rays and solar particle events. Prolonged radiation exposure can damage plant DNA, reduce yields, and potentially make crops unsafe to eat. The CIP study did not fully simulate radiation conditions, which means its results represent something closer to a best-case scenario.
And then there’s water. Growing potatoes requires significant water input. On the Moon, water exists as ice in permanently shadowed craters near the poles — confirmed by NASA’s LCROSS mission in 2009 and subsequent observations. Extracting and purifying that ice for agricultural use is technically feasible but energy-intensive. On Mars, subsurface ice deposits have been detected by orbital radar, and the Phoenix lander directly observed water ice just below the surface in 2008. But accessing these reserves at the volumes needed for farming remains an engineering challenge of the first order.
The research builds on earlier work by CIP that attracted widespread media attention in 2016 and 2017, when the organization first announced that potatoes had survived in Mars-like conditions. Those initial results were met with enthusiasm — and some skepticism. Critics pointed out that the experiments used heavily amended soils and controlled environments that bore little resemblance to actual Martian conditions. The latest round of experiments acknowledges those limitations more explicitly while still arguing that the results validate the potato as a leading candidate for space agriculture.
Other crops are in the running too. NASA has conducted extensive experiments with lettuce, radishes, and chili peppers aboard the International Space Station through its Veggie and Advanced Plant Habitat programs. Astronauts have successfully grown and eaten red romaine lettuce in microgravity — a milestone that, while modest, demonstrated that food production in space is not purely theoretical. But leafy greens and peppers are nutritional supplements at best. They can’t sustain a crew. Potatoes, wheat, and soybeans are the caloric workhorses that any serious off-world food system would need to include.
The economics of space agriculture are daunting. Current estimates put the cost of launching cargo to the Moon at roughly $1 million per kilogram via commercial providers. Mars is more expensive still. Every kilogram of soil amendment, fertilizer, water purification equipment, and growth chamber hardware that must be shipped from Earth erodes the cost advantage of growing food in situ. The calculus only works if most inputs can be sourced locally — which brings us back to the fundamental question of whether regolith can be made fertile enough, with minimal imported materials, to sustain meaningful crop production.
Some researchers are exploring biological approaches to soil amendment that could reduce dependence on Earth-sourced inputs. Certain bacteria and fungi can break down mineral substite and release nutrients in bioavailable forms. Composting human waste — an inevitability on long-duration missions — could provide organic matter. These closed-loop systems are conceptually elegant. Making them work reliably in an enclosed habitat on another world, with no margin for error, is something else entirely.
So where does this leave us? The CIP experiments confirm what space agriculture researchers have suspected for years: potatoes can grow in extraterrestrial soil analogs, but only under conditions that amount to intensive indoor farming with heavy life support. That’s not a failure. It’s a data point. And it’s an honest one.
The path from laboratory proof-of-concept to a functioning lunar or Martian farm is long, expensive, and full of unsolved engineering problems. Radiation shielding. Water extraction. Energy supply. Waste recycling. Crop selection. Soil biology. Each of these is a research program unto itself. Together, they constitute one of the most complex agricultural challenges ever attempted — not because any single problem is insurmountable, but because all of them must be solved simultaneously, in an environment that forgives nothing.
For now, the potato has passed its first audition. It survived. It grew. It produced something recognizable as food in soil that has never known rain, never hosted a worm, never felt the tread of a farmer’s boot. That’s not nothing. But it’s not dinner on Mars, either. Not yet.
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