The Red Grass (TV series)
The Red Grass was a British black-and-white science fiction children's television series about waving red grass that seeds itself all over the world and is fatal to the touch.
A group of ordinary young people with no special expertise or knowledge struggle to understand the Red Grass, where it came from, what its purpose is on Earth, and how to combat its spread and wipe it out before it kills the last human beings to survive.