How to Get Rid of Fungus Gnats in Your Indoor Garden

Fungus gnats are small, dark flying insects that thrive in indoor potted plants. These pesky insects also attack hydroponic gardens and can seriously destroy or inhibit plant growth. They favour damp and moist condition which is why they can be a real pain to gardeners using dripper systems. If you need help with fungus gnat prevention, here are some tips that you can use.
You can use a piece of yellow coloured cardboard similar to the one in the picture. Then, paint the cardboard with corn syrup and place it near the infested plant. Gnats are attracted to yellow and the sticky corn syrup will trap them
Prepare 1/4 inch apple cider vinegar and a drop of liquid dish soap into a plastic cup. Then cover the rim of the cup with a see-through plastic bag and use a rubber band to hold it in place. Put a 1/8 inch hole at the middle.
If your potting soil mix is made of homemade organic compost, heat it in your oven to exterminate the fungus gnat eggs.
You can also use Tanlin which is a popular fungus gnat biological control product. It is composed of microscopic crystals that when eaten by gnat maggots, swell up in their guts and eventually kills the pests.
In this video, Mike Biggs, owner of CX Hydroponics and expert horticulturist, talks about the best way to kill fungus gnats. Visit for more tips on successful hydroponic gardening.

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2 of 16 comments
  • Cordelia
    on May 22, 2020

    I read that the gnats lay eggs in the soil and the larvae eat the plant roots. It was recommended to water with a mixture of water and peroxide (1 part peroxide/4 parts water). This kills the larvae in the soil. It worked for me.

  • Denise
    on Sep 10, 2020

    Thank you all! I will try the ideas.

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