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Joined: Wed Jul 17, 2013 9:11 pm

My endless summer hydrangea are losing their leaves

I'm new to gardening and planted a lot this year! Many plants are doing really well and it has been rewarding to watch everything thriving. However, three smallish endless summer hydrangea I planted on the side of my house, this spring, sort of out of my attention, got what I think is black spot. I probably under and over watered them a couple times, maybe stressing the plants -( it is REALLY hot right now here). I treated them about a week ago by spraying with Bayer Advanced Disease Control for roses, flowers and shrubs. I thought this would fix things. My husband used a fungicide on the grass, which may have gotten on the plants (but the bag of fungicide doesn't indicate that it is hurtful to flowering shrubs). Anyway, I just took a look at the plants and the leaves - perfectly good green leaves - are just falling off the plant. I ended up cutting one of the plants almost completely back, so now there are only some ugly twigs where once I had a plant. Ugh. What should I do now? Pull it up and start over? The other plants don't have the same degree of leaf drop, but it is happening to all of them!

Greener Thumb
Posts: 824
Joined: Sun Jul 05, 2009 8:31 am
Location: Hurst, TX USA Zone 7b/8a

Could you post a picture to be sure? There are some fungal infections and mineral deficiencies that the leaves could show and a picture may help.

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Super Green Thumb
Posts: 25279
Joined: Sun Feb 15, 2009 6:04 pm
Location: TN/GA 7b

What made you think it had blackspot? I think Blackspot, Diplocarpon rosae, is a fungal disease mainly of rose bushes. But hydrangeas have their own leaf spot fungal diseases they are prone to. Cercospora leaf spot is one of them: ... oryid=2773

but there are others. Luis is right that pictures might help.

Also, do clean up the fallen leaves and get rid of them. If it is a fungal disease, those leaves can keep spreading it.

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