hydrangea disease

Question

Our hydrangeas are potted but leaves are spotty with white spots (mildew or fungus) and on some others the leaves are turning brown at tips, then eventually dying off.

Answer 1

The white spots are most likely powdery mildew. For more information on powdery mildew and a course of treatment, please visit the following link:
https://www.gardeningknowhow.com/plant-problems/disease/powdery-mildew-homemade-and-organic-remedies.htm