Fertilizing mediterranean plants

Hi All,
What's the consensus on using fertilizers for mediterranean-climate plants?  I know most of the Proteaceae don't want fertilizers, but apart from them, what do people do?

Initially I gave an application of a balanced NPK pelletized fertilizer with iron once before spring and once before summer: as the garden matures, I've been fertilizing ever more sparingly.
I also have sprinkled fertilizer on roses while bypassing adjacent lavenders, though I don't know if that actually works.

So now in Year 5 for my garden, should I give most everything a light application, or not?

Thanks,
Ben Armentrout-Wiswall
Simi Valley, inland Ventura County,
southern California
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