When I grew up, thorny bushes were called sticker bushes. So I always imagined Stick-on Stickers on the branches.
A childhood belief about plants

others believed things like this
- I used to think that the tree branches moving was making the wind, not the wind making the tree branches move.— Jenny
- I used to believe that the inspection stickers on cars indicated the cost of the car, ie, a 12 meant $12 etc.Anon
- When i was young i thought a stick shift was when u drive with a stickAnon
- I used to think you had to stick those pins that you stick in your hat through your scalp. That's weird.— Angela
- My friend used to think hit me with your rythm stick was hit me with your fiddle stick!! lolAnon
- I used to believe that wind was created by the trees, that it came out of the ends of their branches. — STeve