All my 'Green Ice' mini roses in my window boxes have powdery mildew. II don't think that you need to remove your minis. You can use a fungicide to stop the spread of the mildew (and spray with water underneath the leaves to help prevent it from happening in the future). I was just reading about an organic fungicide called Safer, that you can use if you don't like chemicals.
have cut them back to about an inch from the dirt, do I have to remove them
so my other plants don't get infected- is it in the soil? Also my peonies
are mysteriously drooping in some of their stems. I keep cutting off the
affected ones- anything else I can do. Lastly columbine leaves have I
think mosaic virus, squiggly marks on the leaves- again I cut them right
off but they keep coming back with more like that.
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L. Weiland
Zone 5