Okay, I know, the triffids were not hairy cacti, and they were far more sinister than this mildly ludicrous picture would suggest. But when has accuracy got in the way of good cover art, I ask you? Especially for Sci Fi / fantasy novels.
Personally, I think this image represents the backstory, in which people originally viewed the plants as harmless resources to be ruthlessly exploited for their precious pink oil.
I note that the triffids are facing skywards, looking, perhaps wistfully, back towards their celestial origins. Which leads me to think that maybe this is really the cover art for a book yet to be written. In true 21st century style, such a book would reclaim the story from the perspective of these hard-done-by inter-galactic travellers, unfairly typecast as villains. I’m just stuck for a title. Any suggestions?