Sorry I didn't see this last night. I think actually I might not even have noticed that brown edging to the leaf. I don't know for sure, BUT I would take that to be caused by the recent dryness. I thought by your earler post, when you were describing it, that it was brown spots i.e. a round mark in the middle of the leaf, which as j&b said might be indicative of a disease.
If it were me, I would feed it, if that's as bad as it gets. Sometimes, particularly with Hazel, that brown edging is very common. I have always still fed it.
If it were me, I would feed it, if that's as bad as it gets. Sometimes, particularly with Hazel, that brown edging is very common. I have always still fed it.