Again, though it doesn’t usually spell disaster, it can seriously weaken a plant and the overall vibrancy of its blooms. It can also cause yellow or purple areas to appear on leaves. It causes white, cotton-like fungal growths to form on leaves, usually the undersides. Although it isn’t usually fatal, it’s far easier to prevent this disease than it is to treat it. Powdery mildew is another common fungal disease that can be treated with fungicides.

If you are suffering from an outbreak of this disease, you can use a fungicide to eliminate it, but be sure to dispose of any infected plant debris. Space them properly when you plant and prune regularly to make sure they aren’t becoming overgrown.Īvoid watering late in the day and when you do water, avoid splashing water up onto the leaves of the plant (water from below instead). Flower buds might die before they ever open, and leaf spots often form, too.īecause this is a fungal disease, the most effective remedy is to ensure that good air circulation exists between plants. It causes the petals of your plant to become brown and fall from the rest of the flower. This disease is caused by a fungus known as Botrytis cinerea. Here are some of the most common diseases that affect these popular landscaping shrubs. What is Wrong With My Hydrangea Plant? 7 Common Diseases Flowers that do appear may be small, malformed, or drop prematurely from the plant if they are able to form at all. You might find that a hydrangea that is sick with a disease doesn’t grow as well as surrounding plants – its growth may be stunted or it may fail to produce vibrant blooms. Often, a hydrangea that is seriously ill will lose all of its leaves entirely. You may notice that black and brown spots on hydrangea leaves (these can be dark, yellow, white, or even purple, depending on the specific disease) or that leaves begin to wilt, curl, or dieback. If your hydrangea is infected with some sort of illness, the most common symptoms are those that affect the leaves. There are many, however, that can cause severe cosmetic damage. Hydrangeas are known for their hardiness and they have few serious disease problems that can affect their health. Here are common diseases and problems you need to know when growing hydrangea plants: What Does an Unhealthy Hydrangea Look Like? While most won’t kill your shrubs outright, it is important to be aware of the most common issues so that you can take appropriate steps to ward them off before they become problematic.

The reality is that many common illnesses can come on suddenly without warning. Most hydrangea diseases are easily prevented – but if you find your plants looking anything other than green and lush, you might be wondering what you did wrong.

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