Edit:
Just realized the correct name for the tree is actually maple.
False friend caused mistake because its name is "Ahorn" in German.
Keeping the heading as it is, because it is funny, although it might trigger the Canadians (sorry, dudes!).
I knew it from things like "cherry blossom", meaning "Kirschblüte", so have always assumed "blossom" to be used in completely the same way as "Blüte".
Same for "Blume"/"flower".
Turns out, both assumptions have been wrong.