User blog comment:James12708/Reapers VS. Forerunners VS. Angels from Darksiders VS. Humanity from Halo VS. Council and humanity from Mass Effect VS. Imperium of Man/@comment-4721065-20130112104250/@comment-4721065-20130113091650

Not any plants; only the sentient trees that happened to be living on the Faun Hakkor, the planet in question: fungi and algae were fine, so the Ork spores would be unaffected.