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.
I would only use it as often as is necessary, but wouldn't recommend using it more than twice a week. What is this? If I'm treating a plant for pests or root rot, I'll either spray the leaves or the soil with a hydrogen peroxide solution once a week until the issue has been resolved.
Does Hydrogen Peroxide Hurt Plants? Almost anything in large quantities can be harmful, and using huge doses of hydrogen peroxide in the garden is no exception. When using hydrogen peroxide for plants, however, the solution is generally diluted, making it especially safe.
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.
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.
It is perfectly safe for plants when properly diluted and used in moderation. Adding hydrogen peroxide to water promotes better growth in plants and boosts roots ability to absorb nutrients from the soil. Diluted 3% peroxide adds needed aeration to the soil of plants and helps control fungus in the soil.
Using hydrogen peroxide in plants aerates the soil to create a healthy growing environment. Aeration is one of the most essential elements of healthy soil, and it helps improve root health, nutrient uptake, and encourages beneficial bacteria growth.
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!
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.
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.
Step 1: Mix one part of hydrogen peroxide and four parts of water in a spray bottle. Step 2: Lightly spray the plant leaves and stems where the adult fungus gnats are visible. Step 3: Repeat as needed until the adults are no longer visible.
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.
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.
To disinfect, first clean any visible dirt or grime off the area with plain soap and water. Then spray surfaces with a 50/50 mix of peroxide and water. Let it sit for five minutes or longer. Rinse surfaces that touch food, like cutting boards, but let other surfaces air dry.
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.
If you see signs of houseplant bugs like buzzing gnats or green algae growing on your potting soil, you may need to treat the problem with hydrogen peroxide. Hydrogen peroxide is often a great choice because it is a common household supply and effective at treating unwanted guests.
Dilute 2.5ml hydrogen peroxide and 3 drops of neem oil to a 7500ml spray bottle to spray leaves. 2.5ml ammonia and 2.5ml neem oil once a week for pest control in spray bottle.
Mix one part 3% percent hydrogen peroxide with two parts water and carefully pour it over the root of your plant system with a watering can or spray bottle. This will kill off the bacteria which cause root rot.
Hydrogen peroxide, well known as an ingredient in disinfectant products, is now also approved for controlling microbial pests on crops growing indoors and outdoors, and on certain crops after harvest. This active ingredient prevents and controls bacteria and fungi that cause serious plant diseases.
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.