How do you make hydrogen peroxide spray for plants?

Author: Prof. Hassan Nikolaus III  |  Last update: Wednesday, September 3, 2025

Mix 1 part hydrogen peroxide 3% to 4 parts water. Rinse out, and leave to air dry before using again or before storage.

Do I need to dilute 3% hydrogen peroxide for plants?

You can use hydrogen peroxide on plants to help with root rot, fungus, and pest control. Mix 1 part 3% hydrogen peroxide with 4 parts water and use it as a soil soak or spray. It adds oxygen to the roots and keeps plants healthy. Just avoid overusing it, as it can harm beneficial microbes.

Which plants like hydrogen peroxide?

All plants can generally tolerate hydrogen peroxide, however it must be diluted. If it is left at full strength, it can bleach or damage leaves.

What is the mixing ratio for hydrogen peroxide and water?

Hydrogen Peroxide (H2O2) must be diluted for safe use. To dilute to a 3% solution use 1 part 12% food grade Hydrogen Peroxide to 3 parts distilled water. For example, to make 400ml of 3% H2O2, use 100ml of 12% H2O2 with 300ml of distilled water.

Do water and peroxide keep bugs out of plants?

Hydrogen peroxide can be great for your plants. It can help with pest control and can actually help oxygenate your soil!

How to Make Hydrogen Peroxide Spray for Plants | H202 Spray

How often should I spray plants with hydrogen peroxide?

If you're spraying or watering the soil for fungus, eggs or larvae, be certain you really soak the soil. If you have any of these problems, you can use hydrogen peroxide on your plants once a week.

How to make hydrogen peroxide spray for plants?

Mix 1 part hydrogen peroxide 3% to 4 parts water.

Rinse out, and leave to air dry before using again or before storage.

What happens if you use too much hydrogen peroxide on plants?

Hydrogen peroxide can be used as a natural disinfectant for plants, helping to control fungal infections and other pathogens. However, it's important to use it in moderation, as excessive use can harm beneficial microbes in the soil and potentially damage plant tissues.

What happens when you mix water and hydrogen peroxide?

It reacts very quickly, disintegrating into hydrogen and water without leaving any by-products. This process increases the amount of oxygen in water. The free oxygen radicals then decompose the pollutions, leaving only water.

What does baking soda do for plants?

Prevent Fungal Disease

MAKE IT: Mix 1 teaspoon of baking soda and 2-3 drops of liquid soap in 1 liter of water. Spray the solution on the infected plants. Baking soda helps the plants become less acidic and prevents fungal growth.

How much hydrogen peroxide per gallon of water?

Use 1 ounce of 35% product per 11 ounces of water to make 3% hydrogen peroxide. 1 and ¼ cups of 35% H202 + 14 and ¾ cups of water = 1 gallon (16 cups) of 3% H202.

How to get rid of plant gnats with hydrogen peroxide?

To get rid of fungus gnats, mix a solution of one part hydrogen peroxide with four parts water. Pour the mixture onto the soil around the infested plant.

How do you revive a dying plant with hydrogen peroxide?

First, gently remove the plant from the pot and try and remove as much of the soil as you can from around the roots. Once the roots are completely exposed, pour the hydrogen peroxide mix over the root ball. Repot the plant in a planter with new, damp soil.

How to get rid of gnats in plants?

How to Get Rid of Gnats on Houseplants
  1. Lure Them to Sticky Cards. Gnats are drawn to the color yellow and can be trapped on special yellow cards covered with a sticky adhesive. ...
  2. Food-Grade Diatomaceous Earth. ...
  3. Drench the Soil. ...
  4. Let Plants Dry Out Slightly. ...
  5. Repot.

Can you use regular Epsom salt on plants?

Known as a garden helper, Epsom salt is a natural and effective way to provide essential minerals to plants.

How do you get rid of powdery mildew with hydrogen peroxide?

One powdery mildew organic remedy is to use dilute solutions of hydrogen peroxide (9 parts water to 1 part hydrogen peroxide). Spray it on the plants thoroughly about once a week. Organic removal of powdery mildew is always preferable to using harsh chemicals on your plants.

How long does hydrogen peroxide stay active in soil?

Under anaerobic soil metabolism conditions, hydrogen peroxide degrades with a half-life of ca. 4 hours in samples of nine petroleum-contaminated surface soils from five different states.

How do you dilute 3% hydrogen peroxide for plants?

Mixing a small amount of hydrogen peroxide 3% with water and spraying the solution on the leaves of your plants can help prevent pest infestations. We recommend 1 spoon (15ml) add to 1 litre of room temperature water.

What is the ratio of water to hydrogen peroxide?

Food-grade hydrogen peroxide is extremely strong, so it needs to be diluted before use. 9 The ratio for food-grade hydrogen peroxide is typically 11 parts water to 1 part 35% hydrogen peroxide. This creates a 3% hydrogen peroxide solution.

How to get rid of spider mites with hydrogen peroxide?

Water plants with one part 3% hydrogen peroxide to 4 parts water. You can also put some in a spray bottle to spritz the areas on the leaves with bugs. My plants have never been happier. This is also great for fungus growing in/on your soil.

How to dilute hydrogen peroxide?

The process involves careful measurement of both the hydrogen peroxide and the water to achieve the desired concentration. For example, if you have a 100 mL of 30% hydrogen peroxide solution and you want to dilute it to a 10% solution, you would add 200 mL of distilled water.

Does peroxide keep bugs away?

Spraying your patio furniture and outdoor plants with hydrogen peroxide keeps adult bugs away and can also eliminate any insect eggs before they hatch.

How to oxygenate water for plants?

Air Pump and Air Stone

Air stones are available as an affordable solution for oxygenating water in your hydroponic garden. With the use of an air pump, it's possible to push air directly into the stone, which results in the air splitting into smaller bubbles.

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