Gnats lay eggs on the surface of the soil in pots, mostly near plant stems. They're small, yellowish in color and it takes them three days to hatch. For the next two weeks, larvae will feed on decaying plant material and fungi.

Where do gnats lay their eggs in the house?

Specific egg laying sites include dirty drain lines, poorly cleaned garbage disposals and garbage cans, recycle containers or other places where “organic slime” is allowed to accumulate.

Do gnats lay eggs in the house?

Bathroom and Kitchen Drains

Gnats that congregate around the bathroom or kitchen are likely to lay their eggs in the drain. The adult flies will seek wet organic matter that has built up along the surface of poorly-maintained drains. The eggs will be laid in masses on the slimy surface and take a few days to hatch.