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Old March 15, 2022   #4
RayR
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Join Date: Jun 2010
Location: Cheektowaga, NY
Posts: 2,466
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Ya, misting the seedlings with H2O2 must have done it.
For the same reason you treated the soil with H2O2 to kill pathogens you feared might be in the soil, H2O2 causes plant cell death in the tender seedlings.
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