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!).
Yet according to de.wiktionary.org/wiki/K%C3%A4tzchen :
windbestäubter Blütenstand (ähnlich einer Ähre) an Bäumen und Sträuchern
So not only from willows at least in some context.