>Best I can find is a song called Lemon Tree but which refers to a "yellow lemon tree"; it's credited to Fool's Garden.

...ah yes .. Fool's Garden - file under "melodic bubble-gum rock"

'Lemon Tree' is off their 1996 album 'Dish of the Day' http://www.geocities.com/Hollywood/Lot/7438/fgtree.htm. They are truly one hit wonders. They come from some back-of-beyond place in Schabenland.; the odd accent can be detected in the English lyrics of their sole number one single. Although having had some releases since Lemon Tree, they've had nothing like the same success. I don't know that song "The Lemon Tree" Wordwind was talking about - wonder if it's similar....