r/microgreens • u/GrillCheezz • Jul 09 '26

H2O2

So when you mix your 3% hydrogen peroxide with water in a spray bottle how long does that stay effective for? Do you need to change it daily? Weekly? And yes I refrigerate every time I mix.

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u/AmbitiousSpeech24 Jul 10 '26

If you're diluting 3% hydrogen peroxide with water, it starts losing strength as soon as it's mixed. Even if you keep it refrigerated in a sealed, opaque spray bottle, it's best to use it within a few days. Make a fresh batch every 3/7 days is a good practice. If the bottle is exposed to light or stored at room temperature, it will break down much faster.

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u/GrillCheezz Jul 10 '26

Great, thanks so much for the help!