Via Marginal Revolution, I have a belated St. Patrick's Day edition of trade in everything:
The shamrock (three-leaf clover) is one of Ireland's most recognizable symbols. But demand for "Irish" shamrocks is now so great that the small island nation must import clover seeds from countries like New Zealand, India, and Germany. In 2007, Ireland imported nearly 200 metric tonnes of clover seeds worth $677,864.
