What People Get Wrong About Fungus Gnats on Houseplants

Small flying insects hovering around a houseplant trigger alarm for a lot of plant owners, and a few common beliefs about them turn out to be more myth than fact.

Myth: gnats mean the plant is dying

Reality: fungus gnats are primarily attracted to consistently moist soil, not a declining plant. A perfectly healthy plant that’s simply overwatered can attract them just as easily as an unhealthy one.

Myth: the gnats themselves are the main threat

Reality: adult gnats are mostly a nuisance; it’s the larvae living in the soil that can occasionally damage root hairs, particularly in young or stressed plants. The flying insects you notice are a symptom of a soil condition, not the core problem on their own.

Myth: more water solves most plant problems, including this one

Reality: it’s almost always the opposite here. Letting the top layer of soil dry out noticeably between waterings disrupts the moist environment gnats need to complete their life cycle, which is usually the single most effective fix.

Myth: once gnats appear, the plant needs to be thrown out

Reality: a gnat problem is rarely fatal to the plant and is generally solvable by adjusting watering habits and, if needed, letting the top inch of soil dry more aggressively for a few weeks. Catching it early, at the first sign of a few hovering insects, makes the fix even simpler.