Identify what is effecting plant - Ask Extension
I purchased two hydrangea plants this April that recieve afternoon sun for 4-6 hours. One plant developed dark brown curling of multiple leaves within...
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Identify what is effecting plant #875384
Asked June 30, 2024, 6:02 PM EDT
I purchased two hydrangea plants this April that recieve afternoon sun for 4-6 hours. One plant developed dark brown curling of multiple leaves within 2 weeks, while the other plant only had a few. I removed the effected leaves on both plants but the curling recurred on the first plant. I removed them again and applied Neem Oil. There was no further curling for about 9 days but then it recurred on the first plant, but still not on the second one. I contacted the business I bought them from (including pictures) at the beginning of the problem and again last week (at that time I removed 28 more leaves from the plant). They say the curling is due to sun damage and advised I move the plants to a shaded location. Since this is happening to only one of the plants, I'd like a "second opinion" of what this could be and what action to take to prevent losing the plant.
I have attached a picture of the healthy plant, and 2 pictures of the other plant at the beginning of the problem, and then when it recurred.
Thank you for your assistance.
Marcia
Washtenaw County Michigan
Expert Response
Hi Marcia,
Hydrangeas are woodland plants, so most species need some shade even if labeled as full sun. The amount of shade required will vary depending on soil quality and water availability. Many cultivars are listed as full sun to partial shade, including oakleaf and panicle types. Bigleaf cultivars require moderate shade due to their high-water requirements. Bigleaf hydrangeas require more shade, especially in the heat of the day.
The afternoon sun is too harsh for your hydrangeas, gentle morning sun is preferred by bigleaf cultivars. You question why one has crispy brown leaves and the other is not. It maybe that one plant is getting more water keeping the leaves hydrated. I recommend moving the plants to a shader location.
Thank you for using Ask Extension.
Pam
MSUE Master Gardener
Hydrangeas are woodland plants, so most species need some shade even if labeled as full sun. The amount of shade required will vary depending on soil quality and water availability. Many cultivars are listed as full sun to partial shade, including oakleaf and panicle types. Bigleaf cultivars require moderate shade due to their high-water requirements. Bigleaf hydrangeas require more shade, especially in the heat of the day.
The afternoon sun is too harsh for your hydrangeas, gentle morning sun is preferred by bigleaf cultivars. You question why one has crispy brown leaves and the other is not. It maybe that one plant is getting more water keeping the leaves hydrated. I recommend moving the plants to a shader location.
Thank you for using Ask Extension.
Pam
MSUE Master Gardener
Thank you so much!
Marcia
You're welcome.
