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Old November 12, 2017   #4
dmforcier
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Join Date: Apr 2016
Location: Dallas, TX
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I've used H2O2 to excess in order to explore how it might be detrimental to plants. Short answer? It won't hurt them, and can help.

The only way I was able to hurt plants was to try to start seeds in undiluted 5% solution. Some actually sprouted but didn't live long. Chemically H2O2 is like a very mild bleach. Over two weeks the seeds were bleached white.

Now I use it in a starter soak, in the germinating bag, and injected into the soil of the starter cells. I haven't had a single case of damping off since I started using it. I believe it breaks down in the environment, losing the extra O to become water. So you can't over-apply.
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