Overwatering deprives the roots of the oxygen they need to produce energy to transfer water and mineral salts to the leaves for photosynthesis. This damages the cells of the leaves, distorting them in shape. Therefore, damaged roots cannot absorb and transport more water to the upper parts of the plant. Use our primer of hydrangea problems to identify and treat what’s going on in your yard. Prevention is definitely better than cure. About mid March I removed the dead flower heads and pruned them, taking out about a third of the stems of each plant down to almost ground level. Garden Answers is a division of Garden Answers LLC., a Greendale, Indiana based company that offers cutting-edge plant identification technology for mobile devices and has built a community of gardening experts who offer advice and guidance to our users. Excellent performance of hydrangea plants is guaranteed if the above preventive measures are followed. Home » Outdoor Gardens » Hydrangea Leaves Curling – Causes and Fixes. Now that we have explained the different types of leaf-curls, it is good that we explain the causes. Or should I put it out if it’s misery? Hydrangea plant is not an exception. Another common problem is the Cercos… Low-maintenance landscape plantings are most susceptible to get this disease. Most common cause is a sucking insect such as aphids or lacebug feeding under the leaves when the foliage is young. Lots of diseases that affect hydrangeas will harm the leaves. The hydrangea leaftier, “Olethreutes ferriferana, is a species of tortricid moth in the family Tortricidae.” Wikipedia As a result, the leaves of this plant may curl in three different ways depending on the environmental factors. The first symptoms of this disease are small circular brown or purple spots, which appear on the leaves near the base of the plant. Ailing hydrangea symptoms do often start at the leaves, even if the affecting disease is root or insect based. If you notice spots from a fungus you can use a fungicide to help you get rid of the leaf diseases which is available at most good garden centres and nurseries. In most cases, the leaves curl inwards. 7 April in Problem solving. The main reason for the upward curling of leaves is to seek protection from sunburn exposure now that they don’t have much water to emit. 2. Ensure that from the time of planting up to maturity, the plants are neither deprived of water nor offered excess. Most common cause is a sucking insect such as aphids or lacebug feeding under the leaves when the foliage is young. Cercospora leaf spot is a destructive leaf disease of hydrangea in the landscape and in nurseries. Photo (cropped) by Elizabeth Bush, Virginia Polytechnic Institute and State University, Bugwood.org via via CC 3.0. Since it mostly affects the upper part of the leaves, they will curve up to allow the lower part to conduct the nutrients-production process. Usually with a virus you’ll also see yellowing of foliage not just the curling. Powdery mildew covers the leaf surface, hindering photosynthesis. In most cases, the leaves curl inwards. Then reproduction takes place, making the spot enlarge and spread to other parts of the blade. 3) Diseases. Curly leaves are very disappointing to the gardeners, especially when they occur unexpectedly. My name is Alex K. Worley. Cercospora Leaf Spot (also known as Cercospora hydrangea), is typically brown or purple colored spots at the base of the plant. According to their research, the curling of hydrangea leaves could be caused by one of two insects. This then enables the plant to survive water deprivation for a bit longer. This article offers an explanation in detail on curling variations of hydrangea leaves, causes of curling, ways to stop it, and preventive measures that can be adapted to inhibit it. There is one generation a year with young nymphs hatching from eggs in mid-summer and sucking sap from the undersides of leaves. This disease can affect most of the hydrangea varieties. Hydrangea leaf tips are brown and curling. Response to stimuli is one of the characteristics of all living organisms. The first symptoms are water-soaked spots. 1a. The Cause of Hydrangea Leaf Curl – The Leaftier. Sale. Spray underneath of foliage with insecticidal soap if you see tiny insects on the underside of leaves. 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. Diseases of hydrangea are typically foliar, although root and flowers may also become infected by fungal or viral problems. As stated earlier, hydrangea plants require moderate conditions for better growth and survival. However, ecological changes might affect their health drastically. It’s happening on the newly emerged leaves on one plant and parts of another one that are next to it. One of the most notable reactions of plants towards changes in their surroundings is curly leaves. Make sure that you provide just the right amount of water that the plant needs. Leaves of hydrangea plants curl downwards due to this. If the plant lacks phosphorus, the production of nutrients becomes ineffective, leading to the curling of leaves downwards. 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). There are two types of fungal diseases can infect hydrangeas - cercospora leaf spot and anthracnose. Beckie’s reply: There is a good discussion of the pest you describe on the Toronto Master Gardeners website (torontomastergardeners.ca). Overwatering hydrangea plants causes the plant to show symptoms that are almost similar to an under a watered plant. If needed, protectant fungicides can be applied prior to infection. Knowing about its causes is excellent as it becomes easy to control and prevent. In case one observes such symptoms on their hydrangea plants, here are the ways to stop it. I am a web geek, but you won’t believe how much I love gardening and connecting with nature. Here is why; Phosphorus plays a vital role in boosting the development of hydrangea plants. As a result, the leaves curl inwards. When such types or get exposed to a bit of cold, for instance, they might react by curling their leaves. The attack of hydrangea plants by pests is another common cause of leaf curling. That’s how I decided to build this website – to share gardening knowledge and tips that I’ve researched or learned through experience. Here are some of the means of preventing blade curling from taking place. Virus – least likely but possible. These spots become larger lesions and can kill the leaves. I don’t see any bugs so I assume it’s possible that it was caused by a pre-emergent. They also curl to prevent more water loss to the atmosphere through transpiration. If an herbicide such as weed killer has been applied around the plant or on a lawn surrounding the plant this can cause what you’re seeing. The attack of hydrangea plants by pests is another common cause of leaf curling. This damages the cells early in the life of the leaf so that as the leaves open they are distorted.