Updated: June 24, 2023

Hydrangeas are beautiful flowering plants that can brighten up any garden. However, they are prone to various diseases and fungal infections, which can cause damage to the plant and hinder its growth. One common problem that hydrangeas face is fungus. Fungal infections can lead to leaf spots, wilting, and overall poor health of the plant. In this article, we will discuss effective methods to get rid of fungus on hydrangeas and ensure their healthy growth.

Identify the Type of Fungus

Before treating the fungus on your hydrangea plant, it is essential to identify the type of fungus you are dealing with. This will help you choose the most appropriate treatment method. Common fungal diseases that affect hydrangeas include powdery mildew, leaf spot disease, and botrytis blight.

  • Powdery Mildew: Powdery mildew is characterized by a white or gray powdery coating on the leaves and stems of hydrangeas. It thrives in warm and humid conditions.
  • Leaf Spot Disease: Leaf spot disease causes dark brown or black spots on the leaves of hydrangeas. It is often caused by over-watering or poor air circulation.
  • Botrytis Blight: Botrytis blight leads to grayish-brown spots on the flowers and stems of hydrangeas. It usually appears during cool, wet weather.

Remove Infected Leaves and Flowers

Once you have identified the type of fungus affecting your hydrangeas, start by removing all infected leaves and flowers. This will help prevent the spread of the fungus to healthy parts of the plant. Be sure to dispose of the infected plant material properly, either by burning it or sealing it in a plastic bag before throwing it away.

Improve Air Circulation

Fungal infections thrive in humid and stagnant air conditions. To prevent further spread of the fungus, it is essential to improve air circulation around your hydrangea plants. Prune any overcrowded branches or stems that may be blocking airflow. Additionally, avoid planting hydrangeas in tightly spaced areas where air cannot freely circulate.

Provide Proper Watering

Proper watering practices are crucial for preventing fungal infections in hydrangeas. Water the plants at the base rather than overhead to avoid wetting the leaves. Overhead watering can create a moist environment, which promotes the growth of fungi. Avoid over-watering, as excessive moisture can lead to root rot and other fungal diseases.

Apply Fungicides

In severe cases of fungal infections, it may be necessary to use fungicides to treat your hydrangea plants. However, it is important to choose a fungicide specifically formulated for use on hydrangeas and follow the instructions carefully.

For powdery mildew, sulfur-based fungicides or neem oil can be effective. These products work by suppressing the growth of the fungus and preventing its spread. Apply the fungicide according to the manufacturer’s instructions, usually every 7-14 days until the infection clears up.

For leaf spot disease and botrytis blight, copper-based fungicides are commonly used. They help control the spread of fungal spores and protect the plant from further damage. Again, follow the instructions provided by the manufacturer for proper application.

Use Organic Remedies

If you prefer to use organic methods to treat fungus on your hydrangeas, there are several options available.

  • Baking Soda Solution: Mix one tablespoon of baking soda with one gallon of water and add a few drops of liquid soap. Spray this solution on the affected parts of the plant every week until the fungus disappears.
  • Milk Solution: Mix one part milk with two parts water and spray it on the leaves of your hydrangeas. The proteins in milk act as a natural fungicide and can help control the spread of fungus.
  • Neem Oil: Neem oil is a natural insecticide and fungicide. Dilute it according to the instructions on the bottle and spray it on your hydrangeas to control fungal infections.

Maintain Good Hygiene

Practicing good hygiene is essential for preventing fungal infections in hydrangeas. Regularly remove fallen leaves and plant debris from the base of the plant to eliminate potential breeding grounds for fungi. Additionally, disinfect your gardening tools after each use to prevent the spread of fungal spores from one plant to another.

Conclusion

Fungal infections can be detrimental to the health and beauty of hydrangea plants. By identifying the type of fungus, removing infected parts, improving air circulation, providing proper watering, and using appropriate treatments such as fungicides or organic remedies, you can effectively combat fungal infections on your hydrangeas. Remember to maintain good hygiene practices and monitor your plants regularly to catch any signs of fungus early on. With proper care and attention, your hydrangeas will thrive and bring joy to your garden for years to come.