Seriously, though ;
                  "Home,Boys,Home !" features not one but three, viz the Oak,and the Ash,and the bonny Rowan tree.
          Then there's "Under The Spreading Chestnut Tree " ( complete with hand -movements)
    And the calypsoesque "Underneath the Lemon Tree, My Honey and me .."etc.
    And we should not forget Brian MacNeil's "My Bonny Yew Tree ", nor ,indeed, the official march-past / song of the Royal Navy "Hearts of Oak".