Is hydrogen peroxide safe for plants? Hydrogen peroxide occurs naturally in Rainwater. 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.
Use a spray bottle to soak the infected plants thoroughly. Make sure to get the undersides of the leaves, top of the soil, and around the pot itself. Spray once a week or as you see bugs appear. The hydrogen peroxide will not kill eggs, so you may need to repeat the treatment weekly to remove all the bugs.
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).
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.
As an added bonus, hydrogen peroxide can help discourage unwanted bacteria/fungi that may be lurking in the garden. To give plants an added boost of oxygen or for pest control using the 3% solution, add 1 teaspoon (5 ml.) per cup (240 ml.) of water in a spray bottle and mist the plant.
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.
The oxygen in hydrogen peroxide is what is used to kill mold, bacteria, and fungus. It's so effective that it can even kill some forms of germs. With proper use, this solution can also heighten oxygen levels. The power of this solution is what makes it so useful for plants.
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.
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.
Mix up a solution of 1 part pure hydrogen peroxide (with no additives) to 4-5 parts water. Mix well and water the plant, making sure to thoroughly drench all parts of the soil. The hydrogen peroxide will fizz; that's what kills the larvae and the eggs. Repeat in 2 weeks for a larger pot; in 7-10 days for a small pot.
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.
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.
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!
Another popular method for growers dealing with powdery mildew in their gardens is using hydrogen peroxide. One tablespoon blended with a gallon of water makes an effective solution to be sprayed onto your crops.
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.
Baking soda (sodium bicarbonate) is an effective and inexpensive antifungal agent that is readily available at a supermarket. It is an organic and eco-friendly remedy for black spots and fungal diseases such as powdery mildew.
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.
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.
Mix one part of 3 per cent hydrogen peroxide into two parts water — you can do this in a watering can or spray bottle.
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.