Posted: 08/08/2012 at 13:16
Hi John, I also have this problem with one of my Osteospermums. I'm in the central belt of Scotland with the exact same symptom you describe.
They were performing brilliantly too in early spring (May) and looked really healthy. I think with all this rain and poor summer in general.
Now they look rather brown and desheveled and not sure what to do either, my other osteospermum is fine but in another part of the border. I may try lifting it to see if its the wet or if anthing is feeding on the roots.