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Prevention of powdery mildew on hydrangeas

I'm in Cronulla NSW. Some of my hydrangeas develop powdery mildew when the humidity increases during summer. Can I spray now as a prevention ? for example like I do with Lime Sulphur on roses. Thanks in advance

Flowers and Ornamentals • Diseases

Hi Robyn,

Thank you for contacting Yates.

Yes you can use Lime sulphur on all ornamentals including hydrangeas to prevent powdery mildew, the winter rate is 20ml/L of water. 

Hope this helps and happy gardening.





Answered: 25 Aug, 2021

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