Triffids first appeared in a post-apocalyptic novel in the 1951 that depicted a swarm of people-eating monster plants stalking the countryside. Apparently they were bioengineered in a secret laboratory in the USSR and accidentally got released into the wild (yes we have heard that one before.)
https://en.wikipedia.org/wiki/The_Day_of_the_Triffids

The modern triffids are made of steel, stand taller than the Sydney harbour bridge and they devastate the countryside through a long trail from mining to disposal of toxic junk.
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