Zimmerman couldn't find the origins of "Wearing o' the Green" (I met with Napper Tandy version), though he gives some useful info.

He wrote; "The tune derives from the march 'The Tulip', written c.1747 by the Scottish composer James Oswald. [the song was printed] in 'The Irish Citizen', January 1841".

According to the "Oxford Companion to Irish Literature", the entry for Henry Grattan Curran (1800-76) says "his poetry includes 'The Wearing of the Green". (HGC was the 'illegit.' son of John Philpot Curran, Robert Emmet's lawyer, and father of Sarah Curran, Emmet's fiancee).