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Yes, hydrogen peroxide applied to the soil of houseplants can help destroy the larvae of fungus gnats. However, you will need to dilute it so you don’t damage your plants. Use a 3% solution and dilute it with water (1 part hydrogen peroxide to 4 parts water), then pour it around the base of the plant as if you were watering it. Do this once a week until the gnats are gone.

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