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In the sunny South Midlands we have Summer temps of 30-35C.
-it's not called 'The Apricot Village' for nothing....http://www.aynho.net/
I have seen Sax. caesia in the Dolomites growing in blindingly white limestone in full sun and flowering happily. I have also seen it in the Tatra Mountains in damp shade also looking happy. I agree that a cool root run is probably best and would suggest a crevice garden/trough.