It all started with a discussion on an allotments forum about rhubarb leaf tea, alleged to be efficacious against red spider mite. The moderators removed the post on the grounds that such home-brewed remedies are illegal to make, store, or use.
What nonsense, I thought. An Englishman’s home may no longer be his castle, but surely it can’t be a crime to spray a little rhubarb leaf tea on one’s own plants! Eccentric, certainly. Ineffective, probably. But not against the law.
I was wrong.