Hi. I have recently started growing Pink Ice (Protea Compacta x susannae) for the first time. It is in a large pot in my garden & the leaves have started developing brown spots - photo attached. Can someone help me with identifying the problem and how to solve it? Any info would be greatly appreciated.

I have also included a photo of my 'So Exquisite' (Leucospernum reflexum hybrid) leaves, which seem to be in trouble too if you have any suggestions. Thanks very much!