The message
from "Rupert \(W.Yorkshire\)" contains these words:

As a kid we used to chuck the big burs of something around and we called
those sticky buds. Tried a Google to find out the name but was offered info
on mind expanding legal drugs.

.... Burdock?
Arctium something ?

Well those were the ones my sister and I had 'battles' with. ))

Jennifer - in Bristol