I just learnt that the laurel and the olive tree are the two tree-symbols of Portugal. By coincidence they are also symbols of Apollo (whom I think is the patron of Portugal) and Asklepios, both of them my patrons! I love this little coincidences.
And what interest may this have for the majority of the worshipers? Well you probably already knew about Apollo and the laurel, but that the olive tree is considered a tree of Asklepios is not so well know (in fact the laurel was also often found at his festivals, probably a reminescence of when he was dependent on his father, Apollo, to act). So, you learnt something, which is why I will put this under the "Facets" umbrella.