I used to believe that leaves the color green that had 4 on it growing out of the ground were poisonous, and red leaves that were growing on a tree or out of the ground that had 4 leaves on them were poisonous.
A childhood belief about plants

others believed things like this
- I used to think that leaves fell from the sky.— Chrono
- All flowers had exactly five petals and two leaves.— MD Caruso
- I believed that leaves on trees only became individual when you you close to them, and then I got glasses.— nola
- Trees grew leaves as camouflage so birds would`nd nest in them. Don`t ask.— DaWind
- When I was about seven, I was utterly convinced that chickens had leaves and trees had feathers.— Confused
- I used to believe people grew from spores and when we got old, we'd grow leaves and flowers etc— Calvin (from my pet tiger Hobbes)