Avoid keeping the upper potting mix constantly saturated; let it dry to the depth appropriate for each plant.
Practical steps
- Confirm the plant species and its actual moisture needs.
- Feel the top soil and check the pot’s weight before watering.
- Use a pot with adequate drainage and empty the saucer when appropriate.
- Water thoroughly only when the plant needs it, then allow excess to drain.
- Track adult fungus gnats with a sticky card while you correct moisture levels.
What explains the result?
Many fungus gnat larvae thrive in damp organic potting media, but drought-sensitive plants should not be allowed to desiccate merely to kill gnats. Adjust watering for plant type, season and room conditions.
What to avoid
Avoid making a blanket rule to let every plant dry completely; ferns and some tropical plants have different requirements.
Frequently asked question
Does bottom watering prevent all gnats?
No. It may keep the surface somewhat drier but will not remove eggs or adults by itself.
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