I have one hydrangea, in a row of many, in which the leaves are all curling up, but are still green. The blooms are sub par. What

Question

is wrong with it . I’ve noticed the same thing on a smoke bush in a different part of my yard. How can I correct this? I live in Southern MN

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Answer 1

If you examine the leaves and find no evidence of caterpillars or aphids, you should probably fertilize with some food that will boost the plant's potassium.
Cupping leaves can also simply mean your hydrangea is thirsty. If you are watering regularly, it may be a problem with the roots, which is causing inability to uptake water. Another reason for curling leaves is herbicide injury. Have there been any applications to the grass nearby that could have drifted?

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/plants-potassium.htm

https://apps.extension.umn.edu/garden/diagnose/plant/deciduous/hydrangea/curledcuppeddistortedleaves.html

http://www.ladybug.uconn.edu/FactSheets/hydrangea-diseasesand-pests.php