Avatar for DSwish
Jun 13, 2020 8:10 PM CST
Jersey Shore, NJ z7a
I've been having a problem with my Hydrangea macrophylla. Ive used the following on them throughout the season: fungicide, insecticide, extra watering (I have sandy soil), fertilizer and also aluminum sulfate (for color). They are in the front of my yard and we're supposed to be a focal point of my landscaping. The problem started around July which is mid summer where I am (NJ zone 7a) They looked awful for the remainder of the season. I don't want a repeat of last year. I desperately want to have a nice front yard landscape and it would look beautiful if these were robust, luscious green and full of blooms - instead of brown and crinkly. Can anyone help???
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Avatar for oneeyeluke
Jun 14, 2020 2:06 AM CST
Name: one-eye-luke US.Vet.
Texas (Zone 8a)
Quitter's never Win
Birds Cat Lover Dog Lover Hummingbirder Organic Gardener
Cercospora leaf spot, don't spray water on the leaves when you water. Once you have Cercospora, you will have the spores there which will re-infect every time the conditions are favorable. I would remove the Hydrangea to a new location and plant something else there.
NOT A EXPERT! Just a grow worm! I never met a plant I didn’t love.✌
Avatar for luis_pr
Jun 14, 2020 4:50 AM CST
Name: Luis
Hurst, TX, U.S.A. (Zone 8a)
Azaleas Salvias Roses Plumerias Region: New Hampshire Hydrangeas
Hibiscus Region: Georgia Region: Florida Dog Lover Region: Texas
No, you do not necessarily have to replace them. If you modify or stop overhead watering, use fungicides and keep clean sanitation practices, you can keep the plant and add other hydrangeas too.

I have two infested mopheads by the front door that were switched to drip irrigation decades ago as I applied new clean up techniques. They still have some leaf spots in late summer but not like when I bought the house. And other mopheads, paniculatas and oakleafs planted nearby have not developed leaf spot. While the fungus is almost everywhere, it is not as contagious as black spot in roses when you only water the soil, use fungicides and follow clean sanitation practices.

However, if one does not want to do those things, replace the plants.

For more info, see: The thread "Hydrangea problem" in Ask a Question forum
Last edited by luis_pr Jun 14, 2020 5:03 AM Icon for preview
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  • Started by: DSwish
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