Salads in space? Astronauts try growing own veggies

June 6, 2014
The International Space Station is featured in this image photographed by an STS-132 crew member on board the Space Shuttle Atlantis after the station and shuttle began their post-undocking relative separation. Credit: NASA/Crew of STS-132

As salad ingredients go, romaine lettuce ranks somewhere between limp carrots and dried radishes on the excitement scale.

But add a dash of outer space, and suddenly that frilly leaf is looking downright exotic, especially to astronauts used to food wrapped in plastic.

Gardening in space could become a reality soon if NASA is able to grow its first crop of romaine lettuce on the International Space Station.

Astronauts began the farming experiment in early May and - if it's successful - NASA could make history by the end of year. U.S. astronauts have never eaten food grown in space, agency officials said.

Space explorers might someday tend whole gardens on the way to Mars, said Gioia Massa, the project's science-team leader.

"We want to get to the point where we can grow a variety of things," said Massa, whose list included tomatoes, strawberries and basil.

For now, though, NASA is limiting itself to the "Outredgeous" variety of red romaine lettuce, largely because of the plant's hardiness.

"It was happy in a lot of different environments," she said.

Early testing also showed that the romaine lettuce didn't harbor as many microbes as some other . That's crucial because astronauts in space have weakened immune systems, and washing the plants - a chore well-known to most home gardeners - is difficult in the microgravity of the orbiting station.

So NASA is being cautious and barring its astronauts from eating the first batch of lettuce now being cultivated under red, blue and green LED lights. That crop, which began growing May 8, will be ready for harvesting early this month. Astronauts will pick the plants and freeze them so that leaves can be sent back to Earth later this year.

When the space lettuce is back on the ground, scientists will analyze the plants for microbes and other hazards. A major worry is that space radiation could make microbes more virulent.

But if everything checks out, station astronauts will be allowed to grow - and possibly eat - a second batch of romaine lettuce, potentially by the end of the year.

The lettuce experiment "could be a precursor to learning how to farm and garden out in the solar system," said Trent Smith, the veggie project manager.

Not only do fresh foods provide with some much-needed nutrients, he said, but the plants' consumption of carbon dioxide can help filter the air of a spacecraft.

Though NASA's experiment with romaine lettuce is a first for the agency, it won't be the first time that space-farers have grown plants fit for consumption. Earlier this year, Russian scientists reported that crops they had grown on the station, including dwarf wheat and Japanese leafy greens, were safe to eat.

"The experiments with peas have been very promising," said Margarita Levinskikh, a researcher at the Institute of Biomedical Problems, in a report published by a Russian news agency.

Even if the lettuce experiment is successful, Massa said she expects heavy testing would accompany every new vegetable NASA would grow in space. So a full space salad - complete with romaine lettuce, carrots and tomatoes - likely is several years away.

"We know it's not going to be easy," Massa said of the experiment. But she added that's why NASA has the station. It's "the platform for doing these studies now to (test) what we need for future exploration missions."

Explore further: New romaine lettuce lines launched


Related Stories

New romaine lettuce lines launched

January 18, 2011

California and Arizona, the two largest lettuce-producing states, account for more than 95% of the lettuce grown in the United States. Since the early 1990s, the states' lettuce crops have been subject to "dieback", a disease ...

Peas, other edibles grow in experimental space greenhouse

February 3, 2014

( —Russian cosmonauts on the International Space Station have grown a crop of peas, wheat, and Japanese leafy greens in the ISS greenhouse. The report comes from a researcher with the Russian Academy of Sciences ...

Veggie will expand fresh food production on space station

April 14, 2014

A plant growth chamber bound for the International Space Station inside the Dragon capsule on the SpaceX-3 resupply mission may help expand in-orbit food production capabilities in more ways than one, and offer astronauts ...

NASA: Russia alone can't end space station work (Update)

May 19, 2014

Friction between the United States and Russia over Ukraine won't spell the end of the International Space Station, the head of NASA said Monday, dismissing concerns that one of the world's most prestigious scientific endeavors ...

Recommended for you

What are white holes?

October 9, 2015

Black holes are created when stars die catastrophically in a supernova. So what in the universe is a white hole?

A mission to a metal world—The Psyche mission

October 9, 2015

In their drive to set exploration goals for the future, NASA's Discovery Program put out the call for proposals for their thirteenth Discovery mission in February 2014. After reviewing the 27 initial proposals, a panel of ...

Image: Pluto's blue sky

October 9, 2015

Pluto's haze layer shows its blue color in this picture taken by the New Horizons Ralph/Multispectral Visible Imaging Camera (MVIC). The high-altitude haze is thought to be similar in nature to that seen at Saturn's moon ...

How to prepare for Mars? NASA consults Navy sub force

October 5, 2015

As NASA contemplates a manned voyage to Mars and the effects missions deeper into space could have on astronauts, it's tapping research from another outfit with experience sending people to the deep: the U.S. Navy submarine ...


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.