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 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.
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.
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.
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.
Hydrogen peroxide will also help prevent plant disease like fungus or root rot. You don't need to wait until your plants are already sick. You can use hydrogen peroxide on them to keep them thriving. Use a solution of one teaspoon 3 percent hydrogen peroxide in eight ounces of water.
To dry out soil quickly, you can apply hydrated lime to the soil, add compost and then turn the soil thoroughly to aerate it.
The good news is that most plants will bounce back between 7-14 days if they're given proper care (which includes rehydration). If this isn't possible because major damage was done or little healthy root system exists then expect about 2 weeks until improvement can be seen.
Mix one part of 3 per cent hydrogen peroxide into two parts water — you can do this in a watering can or spray bottle.
The perfect curing combination for root rot would require adding 2.5 teaspoons of 3% hydrogen peroxide per gallon of water. This is equivalent to adding three milliliters of 3% hydrogen peroxide to a liter of water.
Baking soda is one of the most versatile and inexpensive household items you can have on hand. It helps to regulate the pH levels in soil, which is essential for plant growth, and it can also prevent and treat insect infestations and fungal diseases.
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.
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.
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.
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.
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.
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.