My Grandmother had an ornamental chilli plant, with lots of small brightly coloured chillies on it. I was convinced that it was a jelly bean tree and thought she was lying to me because she didn't want me to eat them all. Suffice to say I learnt the hard way.
A childhood belief about plants

others believed things like this
- I thought jelly fish were made out of fruit jelly. — Kevin
- I used to believe 'three bean salad' was an extremely small entree because it contained only three beans.— queeneve
- I used to believe that if you didn't take your socks off at night your feet would turn into jellyAnon
- 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 think a small man named homer lived in my grandmother's freezer and made ice. — ana
- I used to believe that if you crossed your fingers when you were lying, you weren't really lying.— jo