It also breaks down into the soil and releases extra oxygen that helps the plant grow new, healthy roots. Before you use hydrogen peroxide on your plants, you'll need to dilute it. Mix one part of 3 percent hydrogen peroxide with two parts water in a watering can or spray bottle.
If you are treating a sick plant or one infested with insects, use a slightly stronger mixture of one tablespoon of hydrogen peroxide in eight ounces of water. Don't use hydrogen peroxide on your plants more frequently than twice each week. If you make more than you need, you can store it.
For planted seedlings: Spray with H2O2 solution of 1 part H2O2 3% to 32 parts water (eg: around 30mls per 1 litre - measuring cup recommended). For established plants: Mix 1:1 ratio of 3% H2O2 and water (eg: 1 cup of each). Bottom or top water as usual (water soil only, do not pour on leaves).
Fungus Gnats and Fungal Infections
Double-win! To do this, mix a solution with 1 part 3% hydrogen peroxide to 3 parts water. You can use this diluted mixture as a spray or as a weekly watering habit to treat your plants from those pesky gnats.
So, the answer to the question, “Does hydrogen peroxide hurt plants?” is a resolute no, provided the strength is sufficiently diluted. You can purchase hydrogen peroxide in various potencies. The most commonly available is a 3% solution, but they go up to 35%.
If you use a higher concentration of hydrogen peroxide on the foliage of the plant you run the risk of burning it. You could burn the roots, but since it's necessary to kill the root rot-causing bacteria, it's a risk worth taking.
It also breaks down into the soil and releases extra oxygen that helps the plant grow new, healthy roots. Before you use hydrogen peroxide on your plants, you'll need to dilute it. Mix one part of 3 percent hydrogen peroxide with two parts water in a watering can or spray bottle.
Hydrogen peroxide can help to control fungal growth and fungal infection, such as root rot, by preventing the growth of fungi. It can also help kill fungus and bacteria on plant roots.
Mix one pint of 3% hydrogen peroxide into a gallon of water. Water the entire plant, soaking the roots thoroughly, once every week. This oxygenates the root area, promoting development during any stage of the plant's life.
Treat the soil.
Use 1-2 tablespoons of hydrogen peroxide per cup of water, and mix enough to saturate the entire root ball. Mix well, then apply to the soil. Hydrogen peroxide is root safe though it can look a little scary, because it will begin to bubble up when poured in. This is normal!
Apart from being more mindful of how often and how much water you give your plants and plant roots, you can also use a mixture of 3 percent hydrogen peroxide concentration mixed in 1 quart of water once a week to encourage healthy root growth in your plants' roots or treat the spread of root rot and root decay.
Use up to 4 times daily or as directed by your dentist or doctor. Use this product regularly in order to get the most benefit from it. To help you remember, use it at the same time(s) each day. Tell your doctor if your condition does not improve in 7 days or if it worsens.
Make an apple cider vinegar trap
Stir in a few drops of liquid dish soap and place the trap near the base of the affected plant or on top of the soil. You will need to refresh these traps every few days as they attract and kill the adult fungus gnats.
Combine a 4:1 ratio of water and Hydrogen Peroxide 3% – Oxygen Plus in a spray bottle (60ml of Hydrogen Peroxide to 300ml water). Increase to 2:1 ratio if your plant can handle it. Reduce the treatment to once a week until finished. Lightly spray the leaves to ward off unwanted pests.
Epsom salt can improve the blooms of flowering and green shrubs, especially evergreens, azaleas and rhododendrons. Work in one tablespoon of Ultra Epsom Salt per nine square feet of bush into the soil, over the root zone, which allows the shrubs to absorb the nutritional benefits.
Hydrogen peroxide is effective at killing 97% of bacteria, viruses, mould spores, and fungi that are causing your plant to perish. Hydrogen peroxide kills root rot-causing fungi and restores the oxygen balance in the soil which helps your plant root system recover.
For succulents, it's best only to use a few drops of hydrogen peroxide per cup of water. Without diluting your hydrogen peroxide mixture, the chemical will oxidize more than just pathogen proteins and membranes.
Mix 1 part 9% hydrogen peroxide with 6 parts water. Allow top layer of soil to completely dry out before drenching the soil in the peroxide solution. Did It Work? The peroxide drench was very effective in killing larvae, although it never completely killed off the gnat population within the 3 weeks I used it.