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.
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).
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.
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.
When using hydrogen peroxide for plants, the solution is generally diluted, making it safe for roots. To make a safe hydrogen peroxide mixture, start by mixing 1 part hydrogen peroxide with 9 parts water. Next, soak the roots in the solution for 30 minutes.
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.
How to Save Overwatered Plants. Luckily, many plants can be saved if you notice the issue in time. At the first sign of overwatering, grab a bag of fresh soil and a 3% hydrogen peroxide solution.
For the most effective pest control, it's best to spray once per week until you see results. Additionally, using hydrogen peroxide to get rid of larvae in your plants can be a great alternative to chemical-based options. Mix 1/2 cup of H2O2 with 2 cups of water, and water your plants thoroughly.
Hydrogen peroxide both treats and further prevents pest infestation. This weaker solution will prevent damage to the leaves and is effective as a general insecticide.
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.
Cut off any diseased roots using a sterile cutting tool like a knife or scissors. You want to make sure that you're cutting off the roots that are black and mushy. After you've cut off any dead roots, we recommend soaking them in an 80:20 solution of water to hydrogen peroxide. Five minutes or so should be sufficient.
Don't just pour straight hydrogen peroxide on the roots. Instead, create a mixture of one part 3% hydrogen peroxide and two parts water, and put it in a watering can or spray bottle. You can either use it while the plant is still in the pot, or after taking it out of the pot.
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.
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, 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.
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.
Under aerobic soil metabolism conditions, hydrogen peroxide degrades with a half-life of ca. 1.4 hours in diluted test solutions. This half-life value was extrapolated to ca. 7 hours for concentrated test solutions.
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.
Another product that'll help prevent the spread of root rot is non-flavoured cinnamon. After having removed the dead roots, sprinkle a thin layer onto the healthy tissue before placing into a bed of new compost.