fungus gnats on Spider Plant
Quick answer
If your Spider Plant has fungus gnats, the most likely cause is: Fungus gnats (sciarid flies) breed in the upper layer of potting mix and target spider plants kept perpetually moist. The sciarid fly lays eggs in damp compost; the larvae hatch into nearly transparent maggots that feed on decaying organic matter and young plant roots, undermining root health and causing the plant to droop. They are most likely to appear when the soil never fully dries between waterings, which is the exact condition spider plants suffer from when growers water on a calendar instead of by soil dryness.
Start here:
- 1. Allow the top 1 to 2 inches of potting medium to dry out completely before watering again, so the larvae cannot survive in dry medium and adult fly numbers collapse within a week.
- 2. Place yellow sticky cards near the foliage to trap adult fungus gnats and break the breeding cycle.
Why Spider Plant gets fungus gnats
Chlorophytum comosum
Fungus gnats (sciarid flies) breed in the upper layer of potting mix and target spider plants kept perpetually moist. The sciarid fly lays eggs in damp compost; the larvae hatch into nearly transparent maggots that feed on decaying organic matter and young plant roots, undermining root health and causing the plant to droop. They are most likely to appear when the soil never fully dries between waterings, which is the exact condition spider plants suffer from when growers water on a calendar instead of by soil dryness.
How to reverse fungus gnats on Spider Plant
- 1
Allow the top 1 to 2 inches of potting medium to dry out completely before watering again, so the larvae cannot survive in dry medium and adult fly numbers collapse within a week.
- 2
Place yellow sticky cards near the foliage to trap adult fungus gnats and break the breeding cycle.
- 3
If the infestation is heavy, remove and replace the top few inches of potting mix with fresh, dry medium and re-pot only when the rootball has visibly recovered.
- 4
Boost air circulation around the pot with a small fan and reduce overall watering frequency; never let the pot sit in a saucer of standing water.
Keep fungus gnats off this Spider Plant
Water spider plants only when the top layer of soil is dry to the touch; never on a fixed calendar schedule. Use a well-draining mix and a pot with drainage holes so the soil can dry back between waterings. Keep the surface free of decaying leaf debris and quarantine any new plant that arrives with visible gnats.