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Mildew on Dahlias

We have dahlias in pots and beds and all have this white powder on. I guess it’s caused by them being close together and the wet / warm(ish) weather in Kent. I usually wait until frost blackens the foliage before cutting right back and mulching (we don’t take up the tubers here over winter). Since they have this condition now, should I cut them back sooner? 
Thsnks! 

Posts

  • FairygirlFairygirl west central ScotlandPosts: 34,027
    Yes - the air flow can be a problem, and is perfect for powdery mildew to get a hold. 
    If you move them so that they're in a better spot, that will help, but it won't really affect the plants, or their growth as such, it's unsightly more than anything. 
    It's a place where beautiful isn't enough of a word....


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