This lovely flower is a reference to the 6th episode of BBC Sherlock, “The Reichenbach Fall”.
The Rhododendron ponticum was a key clue to Sherlock finding the kidnapped children and also happens to have drug properties such as decreased heart rate and low blood pressure (among others) which has been tied to a lot of theories about how Sherlock got away with the little jump he took.
There is also a version with the text!
(If you would like any other version such as typed instead of written text, a smaller image, or a different placement, just send me a message!).