It's green, makes children cry and could soon become galactic.

No, it's not a bloodthirsty martian preparing to invade Earth.

It's lettuce.

Mars One, a controversial, to send humans to Mars by 2025, is holding a on what to send to Mars on its proposed unmanned mission in 2018.

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One team is aggressively lobbying to grow lettuce on the red planet.

Marketing their plan as #LettuceOnMars, a group of seven students from the University of Southampton Spaceflight Society have designed a greenhouse that could travel with the Mars One lander in 2018 and grow lettuce on the planet's surface.

On their website, the group says : it's edible, space-efficient, has durable seeds and is already cultivated in space.

NASA's "VEGGIE" program has successfully grown lettuce on the ISS using pink LED lamps.

#LettuceOnMars and nine other groups are vying for the final spot, having already made it through one round of cuts. The other groups include a plan to send cyanobacteria with the lander and to germinate seeds on Mars.

Per the Lettuce group's plan, any food grown on Mars will be destroyed after it's cultivated to prevent contamination of the planet's surface.

In late December, members of the group took to Reddit to and generate publicity. The most vital question -- Iceberg or Romaine? -- remains unanswered.

Although voting is now closed, you can check out on the Mars One community page. Winners will be announced on Jan. 5.

In recent months, Mars One has come under fire for its plan to send colonists on a one-way trip to Mars. Despite public criticism, over 200,000 people applied for a position on the 2025 launch. That group has since shrunk to 705 people as Mars One began to filter the selection pool.

Last October, researchers at MIT released a report that said the first Mars One crew to reach Mars would suffocate within 68 days of landing. This feasibility study called into question the Mars One roadmap, but candidates for the flagship mission largely remain undeterred.

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