Carrots? Australia?

Posted by Bob on May 14, 2000

I have been stubbornly working a Telegraph crossword puzzle for days, stuck on a question, but refusing to peek at the answer. I finally gave up, looked up the solution, and I'm as lost as before. The clue was "Carrots can be blue in Australia!" And the answer was Redhead. Is this one of those Britishisms (like cricket slang) that keep us Yanks in the dark? Or am I missing something obvious?