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Hydrangea leaves are getting yellow with rust spots

13 years ago

I planted 3 "All-Summer-Beauty" Hydrangeas this spring in different sun-locations. I fed them with acid in the spring, and they looked amazing till the summer came. At first flowers started get green and dry, and then some of the leaves got yellow with rust spots on it, I thought that maybe the sun and the heat in June was unusually hot for this area and it hurt them, but in the July we got really cool temperature for this summer and spots on leaves are still in progress. What could cause these burned, rusty spots on leaves and why do they get yellow? And when can I deadhead those half-dry flowers? Are they going to bloom this year again if I do it in July?

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