Oh, it's in the DT alright. What you need to do is type garden song into the "Digitrad and Forum Search" box on the main Forum page; it is your friend if you will allow it to be. This will find you a number of past discussions touching on the song, at least one of which will contain lyrics. It will also find you the entry in the Digital Tradition database, which includes a midi of the tune:

GARDEN SONG