Hello! The rocks that you mean are characteristic of a particular area of Tarragona, in Catalonia (Europe), I don't think that you can find these type of rocks in California. As for plants, the foregrounds are different types of Sedum sp., and behind them, we planted Lavandula angustifolia and Phormium tenax. All these plants are fully tolerant with the climate of southern California. Good luck!
Simbiosi
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