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www.hunker.com/12003118/the-hydrangea-leaves-are-dry-curling

Powdery mildew, leaf spot and root rots affect the leaves of a hydrangea detrimentally. Neither powdery mildew nor Cercospora leaf spot are likely to kill the plant, but extreme attack by the Cercospora fungus is likely to lead to a drying and curling of leaves, followed by defoliation.

gardenmaking.com/get-rid-leaf-curl-on-hydrangeas

How do I get rid of leaf curl on hydrangea or prevent the leaf curling pest on Annabelle hydrangeas? Beckie’s reply: There is a good discussion of the pest you describe on the Toronto Master Gardeners website (torontomastergardeners.ca). According to their research, the curling of hydrangea leaves could be caused by one of two insects.

www.gardenanswers.com/plant-pests/curling-leaves-on-hydrangea

There are a few reasons that hydrangea leaves can curl like this - you can think about which one is more likely for your plant, but fungus isn't one of them so you can stop using any fungicide. 1. Most common cause is a sucking insect such as aphids or lacebug feeding under the leaves when the foliage is young. This damages the cells early in the life of the leaf so that as the leaves open ...

homeguides.sfgate.com/dry-brown-leaves-hydrangea-69182.html

3 Curling of Brown Leaves & Buds on an Oakleaf Hydrangea 4 Water Hydrangeas Most gardeners cultivate hydrangeas for the gorgeous, vivid blossoms, taking the leaves for granted.

answers.yahoo.com/question/index?qid=20130304133939AAvo8oW

I bought my hydrangea last year in a supermarket, I kept it outside until winter then I brought it inside my garage for winter time. Now its starting to bloom inside my garage. Its still under 40 degrees outside, so I decided to put it inside my house until spring time in about a month (I Live in Zone 7b). But now the leaves are curling.

www.hunker.com/12584332/why-do-the-edges-of-my-hydrangea...

With their broad leaves and clusters of long-lasting fall and summer-blooming flowers, hydrangea (Hydrangea spp.) is an attractive deciduous shrub that comes with the added bonus of being shade tolerant and low maintenance. A hydrangea with brown leaf margins is likely suffering from a cultural...

davesgarden.com/community/forums/t/1316246

My guess would be to check for pests first. Leaf curling can be caused by any of the following: * by pests: Aphids like tender new growth; you can release lady beetles and beneficial insects to fight off pests. The hydrangea leaf curler caterpillar/moth (and similar pests) hides inside the curled leaves to protect itself from pesticides.

homeguides.sfgate.com/curling-brown-leaves-buds-oakleaf...

The oakleaf hydrangea (Hydrangea quercifolia), which grows in U.S. Department of Agriculture hardiness zones 5 through 9, might develop brown or curling leaves and buds through infestations from a ...

www.endlesssummerblooms.com/resources/q-and-a

Hydrangea Care Questions and Answers. My hydrangea grows beautiful green leaves, but I haven’t seen any blooms yet. How do I get my hydrangea to bloom endlessly? There are a few main reasons that you may not see blooms on your hydrangea bushes: sun exposure, over-watering and over-fertilizing.

www.hgtv.com/.../trees-and-shrubs/a-hydrangea-problems-primer

Small, round, brown or purplish spots on hydrangea leaves are common. Often, affected leaves turn yellowish green and fall off, although the plant usually survives. The problem is caused by a fungus that spreads via spores in wet or humid conditions. To control leaf spot, avoid watering your hydrangeas from overhead, and again, remove and ...