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Growing Roots: Indoor Plant Care Professionals

Commercial & Residential Interior Plantscaping

Fungus Gnats – Professional Interior Plant Care Tips

fungas gnat

Is Gnat Season Over Yet?!

Yes, no one enjoys fungus gnats — especially us!

It is the dreaded phone call… we have gnats!

fungus gnats

How to Treat Fungus Gnats in Indoor Plants

Fungus gnats are small, flying insects that are often found around indoor plants. They lay their eggs in the top layer of soil, and the larvae feed on organic matter and plant roots.

Consistency is key when dealing with fungus gnats. By maintaining a regular schedule of monitoring, drying out the soil between waterings, and utilizing appropriate preventive measures, you can effectively control and prevent these pesky pests from causing damage to your plants. Remaining consistent in your approach to fungus gnat management is essential to break their life cycle and ensure long-term success in maintaining healthy and thriving houseplants.

Implementing a combination of these methods and being patient can help control and eliminate the infestation over time.

steps you can take to treat fungus gnats in indoor plants:

  • Allow the Soil to Dry Out: Fungus gnats thrive in moist conditions. Allowing the top layer of soil to dry out between waterings can help reduce their numbers. Be sure not to let the plants dry out completely, as this can harm the plants.
  • Water Management: Avoid overwatering your plants. Water the plants only when the top inch of soil feels dry to the touch. Ensure that the pots have proper drainage to prevent water from pooling at the bottom.
  • Remove Excess Moisture: Use a turkey baster or a piece of paper towel to soak up any excess moisture in the saucer beneath the plant. This helps eliminate potential breeding grounds for fungus gnats.
  • Use Yellow Sticky Traps: Yellow sticky traps can be placed near the plants to capture adult fungus gnats. The bright yellow color attracts them, and they get stuck to the adhesive surface. This won’t eliminate the problem entirely but can help reduce their numbers.
  • Use a Hydrogen Peroxide Mix: Hydrogen peroxide acts as an insecticide, killing the fungus gnats on contact. To get rid of fungus gnats, mix a solution of one part hydrogen peroxide with four parts water (3% hydrogen peroxide). Pour the mixture onto the soil around the infested plant. It’s a safe and efficient control technique.
  • Apply Beneficial Nematodes: Beneficial nematodes are microscopic organisms that prey on fungus gnat larvae. You can find them at garden centers or online. Follow the instructions on the package for application.
  • Apply Neem Oil: Neem oil is a natural insecticide that can help control fungus gnats. Mix neem oil with water according to the instructions on the product and apply it to the top layer of soil.
  • Use Bacillus thuringiensis (BT): BT is a soil-dwelling bacterium that produces toxins harmful to the larvae of fungus gnats. Mix it with water and apply it to the soil following the product instructions. It can be used as alternative to chemical pesticides.
  • Replace the Top Layer of Soil: If the infestation is severe, consider replacing the top layer of soil with fresh, sterile potting mix. This can help remove existing larvae and eggs.
  • Isolate Infested Plants: If possible, isolate plants with fungus gnat infestations to prevent the spread to other plants. By separating the infested plants, you can contain the problem and minimize the risk of further spread. This proactive approach is key to maintaining the health and well-being of your other plants, as fungus gnats can quickly multiply and cause damage if left unchecked. Remember to monitor the isolated plants closely and implement appropriate pest control measures to eradicate the infestation effectively. By taking these precautions, you can safeguard your plant collection and ensure their continued growth.
  • Maintain Good Plant Hygiene: Remove any dead or decaying plant material from the soil surface, as this can serve as a food source for fungus gnat larvae.


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