The Natural History Museum is currently running a census of cherry trees in Britain. The idea is for people to go on walks and spot cherry trees and then record them on a map.
Guidance is provided on how to identify cherry trees and how to distinguish between the various types.
I really like these attempts to engage the wider public, and to publish this user generated content. My parents regularly participate in similar exercises in respect of birds and plants in South Africa, setting off at ridiculous hours of morning to count parrots or heading off on some jaunt to record clivia numbers (they're very keen on clivia, my folks!)
At the moment, my town shows only four cherry trees, two of which I recorded. I know for a fact that there are hundreds more. Let's hope that we see more being added.
If you're based in Britain, or even if you're just here for a conference or business trip, why not add to the census?