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Is this powdery mildew on my Monarda Mohawk?



Is this powdery mildew on my Monarda Mohawk? If so is it harmful?
It hasn't done very well the last few years so I seperated the plants into smaller pots. Only one has flowered.
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Hi Verdun
Thanks for info.
Def. powdery mildew, but I slightly disagree with Verdun, in that although it is unsightly, it has never caused any long term problems on my Monardas.
When you don't even know who's in the team
S.Yorkshire/Derbyshire border