Fungus Gnats Treatment — How to Get Rid of Them

How to identify and eliminate fungus gnats from your houseplants. Complete treatment guide. This guide covers everything you need to know about this topic, including common causes, step-by-step solutions, and answers to frequently asked questions.

Here are the key things to understand: Tiny black flies hovering around soil surface. Larvae live in top inch of moist soil. Adults are annoying but harmless — larvae can damage roots. One of the most common houseplant pests. Understanding these fundamentals will help you diagnose and resolve this issue more effectively.

The most common reasons this occurs include: Overwatering keeps soil too moist for too long. Organic matter in soil provides food for larvae. New plants may introduce gnats to your collection. Open bags of potting soil can harbor eggs. Identifying the root cause is the first step toward finding the right solution.

To resolve this, follow these recommended steps: Let top 2 inches of soil dry completely between waterings. Place yellow sticky traps near plants to catch adults. Apply mosquito bits (BTI) to soil surface when watering. Use hydrogen peroxide (1:4 with water) to drench soil. If these steps do not resolve the issue, consider consulting additional resources or a qualified professional.

This article is part of our Plant Care Guides collection on Houseplants Wiki. We provide comprehensive, up-to-date information to help you find solutions quickly.