My houseplants have a lot of aggressive gnats. Please advise me. Thank you


This is an annoyingly common problem with houseplants. Fungus gnats are attracted to moisture, so the first thing to do is to make sure that you do not leave any runoff water in or under your plant containers and keep your surface soil on the dry side to discourage breeding. Your plants should be in a containers with drain holes so that they don't retain too much moisture. Going forward, watering plants from below will keep the surface dry but provide plants with necessary moisture.

If your plants are not too delicate, eradicate larvae from the soil by replacing the soil with a fresh sterilized mixture.  Watering the surface with a little castille soap mixed in water can also get rid of the gnat larvae - it usually takes a couple of applications to get rid of all of them.

Once you have corrected the conditions that allow fungus gnats to thrive and reproduce, you can get rid of remaining insects using yellow sticky trap available online. Natural controls take repetition and consistency but it is worth it to get rid of these annoying pests.

Courtesy of NYBG Plant Information Service


  • Last Updated Jan 15, 2021
  • Views 202
  • Answered By Leslie Coleman

FAQ Actions

Was this helpful? 0 0

Ask a plant expert

Send us an email or use the question form below.

Submit a question

Before submitting your question, try searching our Plant and Gardening FAQ page and Help Guides. Still need help? Fill out the form below and a plant expert will answer your individual plant and gardening questions. We will respond to questions in the order we receive them.

Your Question
Your Info

Our system doesn't track which FAQ page you are viewing before you fill out the question form. If you have a specific question related to one of our FAQ entries, please indicate it above so we can better understand your question.

Fields marked with * are required.