Fungus Gnats in Your Houseplants? Pour Hydrogen Peroxide Into the Soil—and Watch What Happens

Fungus gnats in houseplants often begin with consistently wet potting soil—but can diluted hydrogen peroxide kill the larvae hiding beneath the surface? In this video, we test the popular hydrogen peroxide fungus-gnat treatment and reveal what the bubbling actually means. You’ll learn how to identify fungus gnats, find larvae with a simple raw-potato test, and understand why adult gnats keep returning after a soil treatment. We also cover the commonly suggested dilution of one part 3% household hydrogen peroxide to four parts water, along with important precautions for protecting plant roots. Most importantly, you’ll discover why hydrogen peroxide alone may not eliminate the entire fungus-gnat life cycle. Proper watering, improved drainage, yellow sticky traps, and a correctly labeled Bti larval treatment can provide more reliable long-term control. Never use concentrated hydrogen peroxide, and never combine peroxide with other cleaners, pesticides, fertilizers, vinegar, bleach, or ammonia. Sensitive, stressed, rare, or newly transplanted plants may be unsuitable for this experiment. #FungusGnats #HydrogenPeroxide #HouseplantCare #PlantPests #FungusGnatControl #IndoorPlants #PottingSoil #PlantCareTips #HouseplantPests #GardeningTips