When I was about 4 My Brother showed me the movie Jack and the Beanstalk, and I knew my mother had some beanstalks in the garden. I was so scared that the giant would come down and kill me and my family, that when it got dark, I picked up a little flashlight, went to the backyard, and hacked that plant to death. Years later I found out that my mother had brought those (some rare variety) beanstalk seeds back from England.
Also, for years afterward I was terribly afraid of trees. I figured if he can climb down a beanstalk, he certainly can climb down a tree.
A childhood belief about plants

others believed things like this
- My mother convinced all of us kids in our family that the large rhubarb in the garden was a Man-Eating Plant. — H.Miller
- I used to believe that "Earwigs lived in your ears", scared
me to death for years.— Will Chapman - I used to believe that ear wigs would climb in your ears while you slept and make you go mad— troy
- I used to believe that if I ate a fruit's seeds, a plant would grow in my stomach.— Natalia Castillejo
- Before I knew about death, I used to think people turned back into babies again after they got old. Anon
- My Mother used to tell me only the good die young and I would live to be 100+ years old because I was bad.— William