Dick,A modern American sheet music book called "51 Lucky Irish Classics" (!) contains a song called "Would God I were the tender Apple blossom" with the words ascribed to Katharine Mary Hinkson (b 1861). She was a minor Irish poet, mostly known through one poem that was often beaten into schoolkids! Copyright date is given as 1916(Renewed).
It seems too much of a coincidence that Graves had so similar a set. Any source, Eric? A cursory look through some of Graves' book shows only Emer's Farewell.
Dick I'll post words (all two verses), another time.
Regards