The "part of a juniper tree" sounds like a mondagreen; it's so improbable. (I grew up with the Partridge in a Pear Tree version)

In a Zoom singing session last night (4 Dec), I heard Fiona Mackenzie sing a Gaelic language translation on a session last night; she got roses on the twelfth day. Lyrics are on page 31 of http://www.fionamackenzie.org/DuanNollaig.pdf