The words to this song (in Irish ‘Gort na Saileán) are from a poem composed by Irish poet William Butler Yeats and published in 1889:
Down by the salley gardens my love and I did meet;
She passed the salley gardens with little snow-white feet.
She bid me take love easy, as the leaves grow on the tree;
But I, being young and foolish, with her did not agree.
In a field by the river my love and I did stand,
And on my leaning shoulder she placed her snow-white hand.
She bid me take life easy, as the grass grows on the weirs;
I was young and foolish, and now am full of tears.
(The first verse is usually repeated at the end. First verse does use love and the second verse does use life.)