Houseplants bring joy and peace into our homes, but they can also create an environment for unwanted pests. Fungus gnats are annoying but aren’t terribly damaging, and treatment won’t cost you much.
To learn more about how to identify, prevent, and treat fungus gnats on your houseplants, keep reading!
What Are Fungus Gnats?
Fungus gnats are tiny bugs that aren’t a direct threat to the lives of your houseplants, but they are pretty annoying, and their larvae can pack a damaging punch. The larvae feed off of the roots of the plants, while mature fungus gnats will devour fungus, algae, and dead leaves. The key is fungus gnat treatment is prevention and getting rid of them as soon as you notice them.
How Do You Get Fungus Gnats?
As the name suggests, fungus gnats are attracted to fungus. If your plant has any fungal issues, you can guarantee that fungus gnats are on their way or already present. The typical culprit of fungal issues is overwatering. Overwatering can happen any time of year, but many houseplant collectors get overenthusiastic during winter when most plants need the least amount of water.
A good rule of thumb is to let at least the first few inches of soil dry out between waterings.. It’s also important to choose pots with proper drainage to prevent bacteria from growing in soggy roots or at the bottom of the pot.
How Do You Know If You Have a Fungus Gnat Infestation?
Fungus gnats can be a bit sneaky and hard to spot at first, but you’ll notice them when they begin crawling on the surface of your houseplant’s soil or flying around your house. Fungus gnats don’t fly very far, so if you see one flying near a particular plant, it’s probably the infected one.
Your plants are more susceptible to fungal gnats during fall and winter as our plants slow their metabolism and take up less water. With plants drinking less, the soil stays wet longer. An old pot may also be the issue; over time, pots degrade and lose their drainage abilities.
How Do You Get Rid of Fungus Gnats Yourself?
You can get rid of fungus gnats on your own with a two-tiered approach that will destroy both the larvae as well as the mature flies. There are quite a few treatment options for fungus gnats, so you may want to try more than one.
- Sticky Traps: These are small sticky cards that you can tuck right into your pots or containers. The fungus gnats will get stuck, and once the tape is full, you can put it in the garbage. Be aware that if you use sticky traps on outdoor plants, you risk harming wildlife, so only use them indoors.
- Dry Out the Soil: If the fungus gnat infestation isn’t too severe, you can just allow your plant to dry out, which will get rid of the fungus. No fungus means no fungus gnats! Don’t worry; your plant will recover quickly from a brief underwatering.
- Neem Oil: This essential oil has come to the rescue of many houseplant owners. It’s an excellent treatment for fungus gnats because it can kill mature flies and larvae. Spray the leaves with a natural solution of neem oil to kill the adults and saturate the soil with neem oil and water to kill the larvae.
- Hydrogen Peroxide: When mixed with four parts of water, this household product can kill the larvae and any fungus growing on your plants. Pour the mixture into the soil and wait for results.
- Pyrethrin Spray: Pyrethrin spray is similar to neem oil. It’s made from chrysanthemum flowers and is safe for indoor use. Dilute it properly and add it to your soil. Be sure that you do not apply this to any plants that may end up outdoors: it’s harmful to butterflies and bees.
- Replace and Repot: Sometimes fungus gnats can be more damaging than they look, and fresh soil and a new, well-draining pot may be the best method. Take extra precautions to avoid putting the plant into a state of shock.
Try a few methods, and we’re sure that your houseplants will be thriving and free of fungus gnats in no time. If you’re looking for fungus gnat treatments near you, come visit one of our Greenstreet Gardens locations. We’re looking forward to helping you!


