I used to think poison ivy was extremely extremely poisonous, like arsenic or something, and that if you touched it, you would die right away. I could never figure out why people weren't more scared of it. I also thought that all ivy was poison ivy, and when you saw a building covered with ivy, the people living there were taking such a huge risk of perhaps touching the ivy by mistake and dying instantly.
A childhood belief about plants

others believed things like this
- When people talked about serial killers, I thought that they put poison in your cerealAnon
- I used to believe serial killers were actually people that went round slipping poison into cereal boxesAnon
- I used to believe the "hair" in artichokes was poison.— Dawn
- i used to think guns shot poison bulletsAnon
- I used to believe that if you sniffed a really stinky fart, it would poison your insides and die.— Fartcheeks
- i believed that carrots with milk was a deadly poison until i was 11.— Jennifer