Clear Worms in Houseplant Soil: Planarians or Fungus Gnat Larvae? Alcohol Soil Drench Fix

What They Are

Likely fungus gnat larvae (most common), but could be planarians, nematodes, or juvenile earthworms. Regardless, they indicate overly wet soil.

Eradication: Alcohol Soil Drench

1. Let plant dry until pot feels light.
2. Place pot in a large plastic bag (dry-cleaning bag works).
3. Pour enough 70% isopropyl alcohol to equal a normal watering volume.
4. Seal bag; let sit 12–18 hours (bag prevents evaporation).
5. Remove, let alcohol evaporate completely.
6. Resume normal care: water only when pot feels light.

Prevent Recurrence

• Use a bamboo skewer: insert, leave 1 inch above soil. Pull out to check moisture—water only when top ⅔ of skewer is dry.
• Fish tank water didn't introduce the worms; overwatering did.

Safety

Alcohol kills soil pests without harming the plant if allowed to evaporate fully before next watering.