Is Spraying Microgreens With Hydrogen Peroxide A Good Idea?

Lush green sprouts thriving in soil, possibly treated with hydrogen peroxide for healthy growth.

Hopefully, you have some hydrogen peroxide in your medicine or household cupboard and use it for cleaning or disinfecting. But did you know you can use hydrogen peroxide spray in your garden and for your plants? Hydrogen Peroxide accelerates development, protects plants, and kills germs; this is just a shortlist of how peroxide can help flowers.

When growth due to decreased lighting, waterlogging, or, conversely, poor watering, stops, flower growers use peroxide as an affordable way to revive plants.

Can Hydrogen Peroxide Harm Microgreens?

Almost everything in large quantities can be harmful, and use in the garden is no exception. It is not for nothing that it is said: the dose makes the poison!

When used in the garden for growing microgreens, it is usually diluted, which makes it particularly safe to use. So the answer to the question is no, provided you diluted it accordingly!

Spray Plants With Hydrogen Peroxide

For microgreens with root rot or fungal infections, use 1 tablespoon per cup of water. You can also store the solution for further use. But keep them in a cool, dark place, as exposure to light affects their effectiveness.

In the case of root rot, you should water it close to the plants, and if the leaves are fungal, you can spray the leaves with a spray bottle.

In order to sanitize the growing environment and stop the development of harmful bacteria, fungi, and other pathogens, hydrogen peroxide can be used, which can enhance overall plant health and lower the risk of disease.

Pretreat Seed With H2o2

Pre-treating seeds with hydrogen peroxide solution can increase the germination rate. Hydrogen peroxide increases the germination rate by breaking down the seed layer and allowing the seed to take in more oxygen.

Pre-treatment of seeds with hydrogen peroxide:

  • Mix a 1 – 2% solution of hydrogen peroxide
  • Soak the seeds in the appropriate solution for 18-24 hours
  • Then plant your seeds

Old seeds and seeds with hard shells are particularly susceptible to their ability to absorb oxygen. It has been observed that this negatively affects the germination rate. Pathogens transmitted by seeds are also increasingly causing losses in the germination rate, which pre-treatment can improve.

For microgreens, it is enough to use 3% hydrogen peroxide, diluting with water. The technical and food industries employ alternative options.

How to prepare a solution for spraying plants:

  • 1 tbsp. L hydrogen peroxide (3%);
  • 500 ml of water;

Pour into a bottle or spray bottle and spray on the leaf or stems of the plant. Apply once a week. As suggested above. For seed treatment, peroxide can be diluted 1: 1.

Use Of Hydrogen Peroxide To Water Seedlings

Hydrogen peroxide in crop production is used as a dressing for seedlings and various plants. This is mainly because hydrogen peroxide dissolved in an aqueous medium resembles rain or meltwater in its composition. The chemical formula for grade hydrogen peroxide is H2O2.

It contains atomic oxygen, which has the properties of oxidizing the soil and saturating it, as well as plant cells with oxygen. Besides, the destruction of pathogenic bacteria occurs.

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The Effect Of Hydrogen Peroxide On Seedlings

This chemical is also used to water the seedlings of all common micro vegetables. Remember that plants that receive irrigation with regular water noticeably show active growth and the development of their leaves shortly after watering.

Plants grown with hydrogen peroxide give a good harvest. H2O2 is, in fact, a natural pesticide, fungicide, and soil aerator, that strengthens the root system, and stimulates growth.

The properties of using hydrogen peroxide can be useful for any gardening, even for the garden on the windowsill. However, high hydrogen peroxide concentrations can harm delicate plant tissues. It will affect the growth of the roots and result in overall stunted growth.

Additionally, hydrogen peroxide may be toxic to some helpful soil microorganisms, which could upset the balance of the soil ecosystem and possibly harm plant health. The effectiveness of hydrogen peroxide can significantly reduce if you do not properly store and apply it.

It can degrade into water and oxygen when exposed to light and heat. Although hydrogen peroxide may boost the growth of seedlings, you must use it with caution to prevent harming delicate plant tissues and soil ecosystems.

Hydrogen peroxide can be a helpful means in the growth of seedlings if used correctly and in the right concentration.

Hydrogen Peroxide For Seeds And Seedlings

The seeds will germinate faster, and the root system will be stronger and more branched if you soak the seeds in a solution of hydrogen peroxide: 30 drops of 3% peroxide in a glass of water. There are recipes to soak for 30 minutes at 3% without dilution.

Hydrogen peroxide quickly softens the seed coat and kills pathogens located on the seed surface. Watering with a solution of the same concentration helps seedlings develop and strengthen their root system.

Irrigation with H2O2 can be systematic, but not more than once a week. Hydrogen peroxide keeps plant roots healthy. The additional aeration of the soil helps the roots of the plants to absorb micro and macro elements.

The released oxygen “eats” dead roots and does not allow pathogenic bacteria to multiply. Add a tablespoon of hydrogen peroxide per liter of water and water the plants once a week. It is not necessary to water the leaves with this solution as a fertilizer.

Since peroxide is not just 3%, a dilution chart of its various concentrations can help. You must prepare the mixture immediately before use. Water the leaves and stems of microgreens to get rid of aphids, scale insects, and mealybugs.

The oxidizing properties of oxygen in peroxide work against the blackleg and root rot.

Root rot develops per day if the microgreen is flooded and the roots are in stagnant water with a low level of dissolved oxygen: microgreens infected with water with an abundant solution of phosphorous fertilizer + 3% peroxide (2 tablespoons of H2O2 per liter of fertilizer solution) 2 times a week.

The active release of oxygen displaces the anaerobic conditions in the soil; even 2-3 irrigations may be enough to cure. Let the water drain out of the pot well along with the infection, don’t let the pot sit in a pan full of dead water.

Variety of microgreens and sprouts with vibrant leaves, hinting at use of hydrogen peroxide for cultivation.

Peroxide Irrigation And Seedling Spraying

Everyone wants to grow healthy and strong seedlings. There are many ways to grow and fertilize seedlings.

Today, we’ll look at another method for growing seedlings with hydrogen peroxide.

Hydrogen peroxide is well known for its beneficial effects on living things. It is commonly used in both official and popular medicine. It turns out that with their help, it is possible to strengthen and accelerate the growth of seedlings. Microgreens in the wild eat rain or meltwater, which has a beneficial effect on their growth and development.

In our conditions, it isn’t easy to find clean melt and rainwater. And then hydrogen peroxide comes to the rescue. The fact is that a solution of water with hydrogen peroxide is similar in composition and properties to meltwater or rain.

According to its chemical formula, H2O2, hydrogen peroxide contains atomic oxygen, which oxidizes the soil and kills all pathogenic and harmful bacteria, and saturates soil cells and plants with oxygen.

How Does Hydrogen Peroxide Work For Microgreens?

H2O2 is externally indistinguishable from water.

Like water, hydrogen peroxide consists of oxygen and hydrogen, but it has an extra oxygen atom (like ozone-enriched rain during a thunderstorm). H2O2 is an unstable molecule that rapidly loses an oxygen atom. This atom acts as an oxidizing agent, destroying pest tissues: free oxygen kills many pathogens and spores.

Besides, the released oxygen works as a soil aerator. Due to the good oxidizing effect, gardeners use hydrogen peroxide to improve the quality of irrigation water: chlorine quickly disappears from tap water, pesticides, and organic compounds oxidize.

Rainwater also contains H2O2, and it is part of the earth’s “cleaning system”.

The unstable ozone O3 easily adheres to water molecules and decomposes just as easily, various oxidizing pollutions in the atmosphere in the process.


Microgreens receive the trace elements and other materials required for their normal growth and flowering thanks to the inexpensive and efficient tool known as hydrogen peroxide. You can buy the drug at any pharmacy, and the preparation of solutions does not require special skills. Subject to the recommended dosages when using the drug, you may notice a positive result after a few days.

All agricultural sectors around the world use hydrogen peroxide, proving its effectiveness.


  • Deborah, the Senior Editor at Gardeners Yards, comes from the 'Golden Valley' of Herefordshire, UK, where where she honed her passion for gardening, especially herbs, and gained experience in managing a small holding and developing meadow gardens….

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