Both of my Hydrangea's and a rose is severely infected with powdery mildew....

Asked October 23, 2014, 9:29 PM EDT

Both of my Hydrangea's and a rose is severely infected with powdery mildew. Will our harsh winters kill the problem so next spring it won't come back?

Johnson County Missouri

1 Response

Unfortunately, our cold winters will not kill powdery mildew. This fall pick up infected leaves and blooms and dispose of them. If we get a lot of rain next spring and summer and temperatures remain cool like this summer, powdery mildew will be a problem again. Use a fungicide to prevent the spread of powdery mildew. Also, good air circulation helps.