Credit: Twentieth Century Fox Film Corporation

NASA has laid out plans to send people to Mars in the 2030s, but don’t expect these Red Planet visitors to landscape the rocky sphere with fresh produce the way astronaut and botanist Mark Watney does in “The Martian.”

(Spoiler alert) In the movie, when Watney (played by Matt Damon) gets stranded on Mars, he plants potatoes in a greenhouse using Martian soil and his own “metabolic waste.” And it works: He’s able to stay alive for more than a year living largely on potatoes.

Though “The Martian,” which hit theaters last Friday (Oct. 2), is fairly realistic, growing food on Mars wouldn’t play out exactly as described on the big screen. And it would take hundreds of years before the Red Planet could be farmed without protective greenhouses, according to Paul Sokoloff, a botanist at the Canadian Museum of Nature. [7 Most Mars-Like Places on Earth]