Does anyone know when to pick oranges in NZ? Have two orange trees, don't know the variety, but as appealing as the fruit looks on one of the trees its still quite bitter. And I'm getting impatient looking at all the lovely oranges on the tree! (I picked some yesterday and will be spending this afternoon trying to figure out what to do with bitter oranges! )

The second tree has only started fruiting, so the fruit is still green. (Well, I think its an orange tree too!)

I can't find anything specific to when to harvest the oranges here in Marlborough - does anyone know or can recommend a good website / book to advise? Thanks.