The hydrangea is between the house and driveway. Afternoon sun. Abundant blossoms. Leaves are not yellow. White puffy spots underside of lower leaves.
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How to Treat Downy Mildew?
Downtoearthdigs
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on July 5, 2015
Here is a link for you with more information.
Allowing more air circulation is the most important preventative measure.
https://www.gardeningknowhow.com/plant-problems/disease/downy-mildew.htm
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