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Franco
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Location: New Jersey

Leaves turning purple

I have a hydrangea in the front of my house and it is doing well, but a few of the leaves are starting to turn purple. The spot it is in gets about 4-5 hours of morning sun and then partial shade for the rest of the day. I water regularly. Any ideas?

luis_pr
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Location: Hurst, TX USA Zone 7b/8a

Hello, Franco. Can you post pictures of the shrub, the affected leaves (top and bottom)? The majority of the spots in hydrangea are fungal in nature. There a common leaf spots but you can also have powdery mildew and cerspora leaf spot. They all can produce purple spots.

The only time this is not an issue is in the Fall when many hudrangea leaves turn Fall colors such as red, orange and -of course- purple. But it is way too early for this to be the cause.

Just wondering, do you water the leaves or does the sprinkler get the leaves wet?

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Franco
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I do water the leaves.

[img]https://i15.photobucket.com/albums/a388/DaRealFranzy/100_4547.jpg[/img]

[img]https://i15.photobucket.com/albums/a388/DaRealFranzy/100_4546.jpg[/img]

[img]https://i15.photobucket.com/albums/a388/DaRealFranzy/100_4545.jpg[/img]

luis_pr
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Joined: Sun Jul 05, 2009 12:31 pm
Location: Hurst, TX USA Zone 7b/8a

This one is tough to properly diagnose because it can be one of two things that we cannot easily (or cheaply) diagnose.

Winter damage to leaves can cause opportunistic fungal infections that develop when the winter injuries in the leaves get wet often. Treat it as if you had a case of leaf spots.... Never water the leaves. Instead, water the soil early in the morning. Allow separation between plants to increase air flow and reduce the chance of fungal problems. Do not overwater and do not let the mulch stay wet for long periods of time. Prune dead stems and pick up any plant debris. Dead or dried out blooms/leaves should be disposed in the trash.

In addition to fungal infections, the weather can also cause some hydrangea leaves to turn these reddish/purplish colors early. Some varieties that produce red-purple colors in Fall may develop them early when the weather cooperates. If this is the case, you do not need to take any action.

To correctly diagnose, you would need to send a leaf sample in a sealed transparent plastic envelope to your Agriculture Extension Service or a university. Or just follow the good sanitation suggestions given for fungal problems... no need to apply fungicide.

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Franco
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Location: New Jersey

Thank you very much :)

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