Plant Problem Guide
Fungus Gnats
Fungus gnats are tiny flies often seen around damp houseplant soil. They are annoying, but usually manageable once you reduce excess moisture and interrupt their life cycle.
Wet Soil
Gnats are attracted to consistently damp soil where they can lay eggs.
Organic Matter
Larvae feed on decaying organic material in the top layer of compost.
Poor Airflow
Still, humid conditions can keep soil damp for longer than needed.
Overwatering
Watering too often gives gnats the moist surface conditions they love.
Quick Checks
- Are tiny black flies hovering around the soil?
- Does the top layer stay damp for several days?
- Are flies worse after watering?
- Do you see movement on the soil surface?
- Is the plant in a pot with poor drainage?
What To Do First
- Let the top layer of soil dry more between waterings.
- Remove fallen leaves or decaying plant material from the pot.
- Use yellow sticky traps to catch adult gnats.
- Improve airflow around the plant where possible.
- If the soil is staying wet too long, consider repotting into a freer-draining mix.
Soil staying wet too long?
Use the Rare Leaf Soil Finder
Match your plant and care style to a soil blend that supports better drainage and airflow.
Still unsure?
If you are not sure whether you have fungus gnats or another pest, visit the Plant Help Hub and send us a photo.
Visit Plant Help Hub