How to Get Rid of Fungus Gnats on Your Houseplants

1. Let the Soil Dry Out

Larvae need moisture to survive. Let the top 1–2 inches of soil dry out between watering. This interrupts their life cycle.

2. Use Sticky Traps

Place yellow sticky traps near the base of your plants to catch adult gnats. These traps help reduce their population quickly (as shown in the image you provided).

3. Repot the Plant (If Necessary)

If the infestation is severe, repot the plant with fresh, sterile soil. Dispose of the old soil in a sealed bag.

4. Apply Biological Controls

• Beneficial Nematodes (Steinernema feltiae): These microscopic worms eat larvae in the soil.
• Bacillus thuringiensis israelensis (BTi): A natural bacterium that kills fungus gnat larvae. Available in products like Mosquito Bits or Gnatrol.

5. Water with Hydrogen Peroxide Solution

Mix 1 part 3% hydrogen peroxide with 4 parts water and water the soil. This will kill larvae without harming your plant.

Prevention Tips

• Avoid overwatering: only water when the topsoil is dry.
• Use pots with good drainage.
• Cover the topsoil with a thin layer of sand or decorative pebbles to discourage adult gnats from laying eggs.
• Quarantine new plants before placing them near others.

Bonus DIY Gnat Trap

Mix apple cider vinegar, a drop of dish soap, and a bit of water in a small dish. Place it near your plants. Gnats are attracted to the vinegar and get trapped by the soap.

Conclusion: Fungus gnats may be tiny, but they can wreak havoc on your indoor garden if left unchecked. Thankfully, with a few consistent actions and preventative steps, you can rid your home of these pests and keep your plants healthy and thriving.