Share this reel with a plant lover! You can also use hydrogen peroxide to treat root-rot in suffering plants.To treat for rot, I use 2 parts 3% H202 to 1 part water & let the roots soak for about an hour. I know many people who use it to beat fungus gnats and other pests in their plants. This mixture can be added to a spray bottle & sprayed directly on the leaves to treat certain pests.Have you ever used hydrogen peroxide for planty related things? | Easy Growing