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Bordeaux Fungicide: A Comprehensive Guide to Protect Your Plants

by Gregory
3 minutes read

Bordeaux Fungicide: A Comprehensive Guide for Beginners


Bordeaux fungicide is a powerful spray that can protect your plants from a wide range of fungal diseases and certain bacterial issues. It is made from a combination of copper sulfate, lime, and water. You can buy a pre-mixed solution or make your own Bordeaux fungicide as needed.

Benefits of Bordeaux Fungicide

Bordeaux fungicide is effective against a variety of fungal diseases, including:

  • Downy mildew
  • Powdery mildew
  • Black spot
  • Fire blight of pear and apple

It can also be used to prevent bacterial diseases such as fire blight.

How to Make Bordeaux Fungicide

To make your own Bordeaux fungicide, you will need:

  • 10 pounds copper sulfate
  • 10 pounds hydrated lime
  • 100 gallons of water


  1. Dissolve the copper sulfate in a small amount of water in a glass jar.
  2. Dissolve the hydrated lime in a separate container.
  3. Slowly add the copper sulfate solution to the lime solution, stirring constantly.
  4. Add water to make a total of 100 gallons.

How to Use Bordeaux Fungicide

Bordeaux fungicide should be applied to plants in the fall or winter, before new growth begins. It can be applied with a sprayer or a brush. Be sure to cover all surfaces of the plant, including the leaves, stems, and branches.

Safety Precautions

Bordeaux fungicide is corrosive, so it is important to take precautions when using it. Wear gloves, a mask, and eye protection. Do not apply Bordeaux fungicide to plants that are near food or water sources.


Bordeaux fungicide should be stored in a cool, dry place. It can be stored for up to one year.


If you are having trouble controlling a fungal disease with Bordeaux fungicide, there are a few things you can try:

  • Increase the frequency of your applications.
  • Use a stronger concentration of Bordeaux fungicide.
  • Apply Bordeaux fungicide to the soil around the base of the plant.

Additional Tips

  • Bordeaux fungicide can leave a blue-green stain on plants. If you are concerned about the appearance of your plants, you can apply Bordeaux fungicide to the undersides of the leaves.
  • Bordeaux fungicide is not compatible with pesticides. Do not apply Bordeaux fungicide to plants that have been recently treated with pesticides.
  • Bordeaux fungicide can be corrosive to metal. Be sure to rinse your sprayer thoroughly with water after using Bordeaux fungicide.


Bordeaux fungicide is a powerful tool for controlling fungal diseases and bacterial issues in the garden. By following the tips in this article, you can use Bordeaux fungicide safely and effectively to protect your plants.

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