Oranges are not the only fruit

I'm in Spain at the moment and in San Miguel De Salinas 'Oranges are not the only fruit', but by the amount on all the trees in town they may as well be.
Today, (you can just see one of them lurking about to step up his ladder in the background) the council were picking them and according to my brother he's pretty certain that they go for Marmalade to Dundee but he's not sure.
Whatever that means!!