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


25 August 2021 01:23 PM

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.



Topics: Flowers and Ornamentals Issues: Diseases