Now that is a seriously impressive plant...but I dont buy for a minute they didn't know what it was, I bet they have been really enjoying their retirement!
"Ethel, you wanna cuppa herbal tea love?"
"No thanks Eric, I'm still feeling a bit funny after that last one you made, and I've gotta go collect me pension and pay the water rates at 11."
In all seriousnous though they are pretty handy at that gardening lark to grow a tropical plant like that outside in the British climate. Can't imagine the buds on it being overly massive though tbh...just enough to keep them in herbal teas one would think.