...the most likely candidate would be "a less fussy plant", possibly the common weed arabidopsis.
"Arabidopsis thaliana is a common plant used for laboratory research. It is a member of the Brassicaceae, or Mustard family, along with broccoli and cauliflower. Arabidopsis is considered to be a "model" organism because it is easy to grow in the lab, it has a short life cycle and makes lots of seeds (which makes it good for genetics) and it has a small genome compared to other higher plants (like maize)."
Space broccoli. That sounds like a bad idea - carpet bombing the Martians with space broccoli.