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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3 of 13 comments
  • Bodega
    on Jan 18, 2019

    Those little gnats drive me crazy as they also like perspiration, eye goo, etc. But the vinegar and blue dish soap work a treat.

    • Pat
      on Jun 9, 2019

      I caught a gazillion gnats with this trick! No kidding!

  • Terri
    on Jan 18, 2019

    These little bugs love moisture, so don't over-water your plants. Also, avoid the problem if possible. DON'T buy any potting soil that advertises that it holds moisture -- these bags are often infested with fungus gnats and will quickly make your life a living h***. Stores will not refund, won't replace very plant you have had to throw out, and can't compensate you for the misery you will experience. I buy potting soil in the fall, let it sit outside and freeze all winter to kill anything hiding within, then use it to repot in the Spring. Thanks for the tip about corn syrup n cardboard!

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