Using Baking Soda to Control Powdery Mildew: A Complete Guide

Powdery mildew is a common fungal disease that affects a wide range of plants, from vegetables and fruits to ornamental plants and trees. It appears as a white, powdery substance on the leaves, stems, and sometimes fruits of plants. If left untreated, it can severely weaken the plant, reduce yields, and even lead to plant death. Fortunately, there’s a simple, eco-friendly solution right in your kitchen: baking soda. In this guide, we’ll explore how to use baking soda as an effective remedy against powdery mildew.

Using Baking Soda to Control Powdery Mildew: A Complete Guide

Why Baking Soda?
Baking soda, or sodium bicarbonate, is a natural substance that has been used for various household and gardening purposes for centuries. When it comes to controlling powdery mildew:

  • Alkaline Environment: Baking soda creates an alkaline environment on the plant’s surface, which is inhospitable for the growth of powdery mildew fungi.
  • Safe for Plants: Unlike many chemical fungicides, baking soda is gentle on plants and won’t harm beneficial insects.
  • Eco-Friendly: Baking soda is biodegradable and poses no threat to the environment.

How to Use Baking Soda for Powdery Mildew:

  1. Prepare the Solution: Mix 1 tablespoon of baking soda with 1 gallon of water. Add a few drops of liquid soap to help the solution adhere to the plant’s surface.
  2. Test First: Before spraying the entire plant, test a small area and wait 24-48 hours to ensure there’s no adverse reaction.
  3. Spray the Affected Plants: Thoroughly spray the baking soda solution on the affected plants, ensuring you cover both the top and bottom of the leaves. The solution should coat the leaves but not drench them.
  4. Regular Application: For best results, apply the baking soda solution once a week and after any rainfall. This will not only treat existing powdery mildew but also prevent new outbreaks.
  5. Monitor and Adjust: Keep an eye on the plants and adjust the frequency of application based on the severity of the infection.


  • Avoid applying the baking soda solution during the hottest part of the day, as it can cause leaf burn.
  • While baking soda is effective against powdery mildew, it won’t cure other fungal diseases. Ensure you’ve correctly identified the problem before treatment.
  • Overuse of baking soda can lead to a buildup of salts in the soil, so use it judiciously.

Baking soda is an effective, eco-friendly, and affordable solution for controlling powdery mildew in your garden. By regularly monitoring your plants and applying the baking soda solution, you can keep your garden free from this pesky fungal disease.

For more DIY solutions and gardening tips, be sure to visit Whether you’re a seasoned gardener or just starting out, you’ll find a wealth of information to help you grow a healthy, beautiful garden.

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