what is up with Hydrogen Peroxide?

I have read bits and pieces about using Peroxide in growing weed, but no explanation about what it does for the plant, or is it for the soil? Please, can someone put it in terms I can understand? Big THANKS!!

uhhh I don't think its put anywhere ON the plant or in the soil...I'm pretty sure that would fuck something up. It's used in cloning to sterilize scissors but I've never heard of it being used for growing.

it's used mostly in hydro..

controls bacteria/alge growth in the water, adds oxygen to water and im not sure what else it does.

H202 can be used in hydroponic set ups to help eliminate root rot.


My question is what is all this stuff I keep hearing about not being able to use it with organic nutrients?


I keep reading conflicting information.

Is there anyone out there who has used H202 with Organic Nutes such as Foxfarm?

you can't use h2o2 with organ nutes because the h2o2 is like an acid and kills the nutes..

I used it because I had a white film on my root sponges in an aerogarden. I thought it might be mold and that the hydrogen peroxide would clean it off. I read somewhere on ROI that it is good for the plants, although I can't say where, I lurk here a lot in a lot of places, sorry. It seemed to have helped the problem though. Good luck.

lots of people use that shit when they water their plants, I myself have never used it so I can't comment on how it works. I'm pretty sure it is just used to help oxygenate the soil therefore providing more oxygen to the roots...not 100% sure, it might have other beneficial aspects.

it has many uses, most of which are cleaning and disinfecting. its helpfull in DWC for disease control. if you use it in an organic grow you can kill off your microherd which will make less nutrients availible. quite a few people add it to thier nute solution because they say it airates the solution, i think this is way overrated as a pump and airstone is a much more economical solution.

This info was passed to me by SupA NovA FoX
It gives more oxygen.

I guess you could use it for soil, but it IS NOT for organic grows as it will kill the good bacteria that the organic people want. For Hydro, it worked for me.


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It actually breaks down to H2O...the extra O2 atom is unstable so it jumps "ship" a quickly as it can oxidize something such as bacteria, mold, rot, ect. ect. This oxygen atom is extremely reactive and will attach itself to either another O- atom forming a stable Oxygen molecule or attack a nearby organic molecule. Both the stable and O- forms will increase the level of dissolved oxygen (providing the roots with more oxygen). Pre treating the water supply with H2O2 will drive out the Chlorine many cities use to sterilize it. This will also degrade any pesticides or herbicides that might be present as well as any other organic matter. Well water can be high in methane and organic sulfates, both of which H2O2 will remove. Many disease causing organisms and spores are killed by Oxygen, the free Oxygen H2O2 releases is extremely effective at this. H2O2 will help eliminate existing infections and will help prevent future ones. It is also useful for suppressing algae growth. The free Oxygen atom will destroy dead organic material (i.e, leaves roots) in the system preventing them from rotting and spreading diseases.
Roots require Oxygen to breathe and low levels are the main cause of almost all root diseases. Both soil and hydroponic plants often fall prey to the same syndrome although it is rarely recognized as what it really is. Hydroponic crops often fail due to "root rot" and soil crops succumb to "over watering." The real cause of both these problems is a shortage of Oxygen at the root zone. In a soil system the soil consists of particles, a film of water on the particles and air spaces between the particles. When too much water is put into the soil the air spaces fill with liquid. The roots will quickly use up what Oxygen is dissolved in the water, if they haven't drunk enough of the liquid to allow air back in to the soil spaces they will stop working. In this situation roots will start dying within twenty-four hours. As the roots die the plants ability to drink water and nutrients will decrease, this will cause symptoms of nutrient deficiencies (mostly pale, slow, weak growth), and strangely they will start to wilt like they don't have enough water. It is easy to make a fatal mistake at this point and add more water.

In a Hydroponic system the cause is a more direct simple lack of oxygen in the solution; this may be from inadequate circulation and/or aeration. High reservoir temperatures also interfere with Oxygen's ability to dissolve in the water. Temperatures above 70F (20C) will eventually cause problems, 62F-65F (16C-18C) is recommended( the use of peroxide also enables temps in the resevior to go a little bit higher then recommended without causing alge, ect.). The same symptoms will appear as with soil plants but you can also check the roots. Healthy roots should be mostly white with maybe a slight yellowish tan tinge. If they are a brownish color with dead tips or they easily pull away there is at least the beginning of a serious problem. An organic, ‘dirt like’ rotting smell means there is already a very good chance it is too late. As roots die and rot they eat Oxygen out of the water, as Oxygen levels are even further depleted more roots die, a viscous circle may be well under way. Reduced Oxygen levels and high temperatures both encourage anaerobic bacteria and fungi. The plants may still be saved but you will have to work fast.
When plants are watered with H2O2 it will break down and release Oxygen into the area around the roots. This helps stop the Oxygen from being depleted in the water filled air spaces until air can get back into them. High Oxygen levels at the roots will encourage rapid healthy root growth. In a Hydroponic system H2O2 will disperse through out the system and raise Oxygen levels as it breaks down. Strong white healthy roots with lots of fuzzy new growth will be visible. This fuzzy growth has massive surface area allowing for rapid absorption of the huge amounts of water and nutrients needed for rapid top growth. A healthy plant starts with a healthy root system.
H2O2 comes in several different strengths 3%, 5%, 8% and 35%, 35% is also sold as food grade Hydrogen Peroxide. The most economical is 35% which is recommend be diluted to 3% before using, as at this high concentration it can cause damage to skin and clothing. When working with food grade H2O2 it is very important that you clean up any spills or splashes immediately, it will damage almost anything very quickly. This is extra important with skin and clothing. Skin will be temporarily bleached pure white if not washed cleaned. Gloves are strongly recommended when working with any strong chemical.
Food grade H2O2 can be diluted to three percent by mixing it one part to eleven parts water (preferably distilled). The storage container should be opaque to prevent light from getting in and it must be able to hold some pressure. Three-liter soda bottles are ideal for mixing and storing H2O2. There are twelve quarter liters (250ml) in three liters, if you put in one quarter liter (250ml) H2O2 and eleven quarter liters (250ml) water in the bottle it will be full of three percent H2O2 and the bottle can hold the pressure that the H2O2 will generate. Three percent Hydrogen Peroxide may be added at up to three ml's per liter (2 1\2 tsp. Per gallon), but it is recommended that you start at a lower concentration and increase to full strength over a few weeks. Use every watering even on fresh cuttings. For hydroponics use every reservoir change and replace twenty-five percent (one quarter) every day. Example: In a 100L reservoir you would add three hundred ml's (3%) H2O2when changing the nutrient. You would then add seventy-five ml's more every day.
35% food grade: called food grade because it has no toxic impurities. Of course your local hydroponics retailer, whom you can locate over the web.(there may be shipping restrictions on high strength peroxides). The local feed supplier may have it in small towns. Prices range from fifteen dollars per quarter liter to eighty dollars a gallon. One gallon will treat up to fifty thousand liters of water.

3%5%, 8% Can be found at most drugstores or pharmacies, prices start at a less than a dollar for a one hundred-ml bottle that will treat one hundred liters.

That was a lot of info, but it should answer your questions...or most of them As for it breaking down, the solution once added to your res. should break down in roughly 3 days time, so adding it in twice a week to your res. when it gets low enough is a good idea.


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IMHO, for a plain jane soil grow, this should not hurt...BUT if your growing 100% organic, this will screw you up big time.

OMG!!! Big Mahalo for all that info. And I could understand it, so YEA!!
So if I add 2tsp. to about 1 and 1/2 gals. of water to start with, everytime I water will help my roots, thats great, because I am doing a soil grow. thanks again.

lehua96734 said:

OMG!!! Big Mahalo for all that info. And I could understand it, so YEA!!
So if I add 2tsp. to about 1 and 1/2 gals. of water to start with, everytime I water will help my roots, thats great, because I am doing a soil grow. thanks again.

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if your using any benificial bacterias, or mycho fungi the h2o2 will kill it. everybody does things different but i wouldnt use it for a soil grow myself. i use it in my DWC buckets to keep my roots clean but i do not use it in my rockwool or hydroton because i use mycho fungi.

good luck.

I tried using it in my soil grow for a while. I stopped using it because I was having some lockout issued and wasn't sure what was causing it. It didn't seem to help at all...I'll say that.

SlikWiLL13 said:

if your using any benificial bacterias, or mycho fungi the h2o2 will kill it. everybody does things different but i wouldnt use it for a soil grow myself. i use it in my DWC buckets to keep my roots clean but i do not use it in my rockwool or hydroton because i use mycho fungi.

good luck.

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i use voodoo juice, so you're saying it would negate the enzymes in it correct?

so what do you use instead?

Great post DH! But it seems kind of like a band-aid fix to me. Better to provide adequate O2 to your roots to begin with.

Emphasis on the last part though.

If you are growing organic it will screw you up big time!

hater hurter said:

i use voodoo juice, so you're saying it would negate the enzymes in it correct?

so what do you use instead?

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im not 100% sure about enzymes...i think hygrozyme claims to be compatible with H2O2 in low ppm's but dont quote me.

and i dont use anything instead although i might start using H2O2 and straight chem nutes again because i dont really like the mych's and enzymes ive been trying.

yes it is slik, i just found another website that says use it in conjunction with h202.