gnats seem to float about doing nothing at all but irritating you ...

is there any sign of them being in or on the plants ... tip a plant out of its pot and see if they are in the soil ...

ken

google 'fungus gnats' and see if that helps you .... ken

Thank you, that was very helpful!

If you do have fungus gnats, a mosquito dunk, soaked overnight in a gallon of water, should help. I can't remember where I first saw that remedy for fungus gnats, but it helped me tremendously. I think it kills the gnat larva, if I'm not mistaken.

You can find the mosquito dunks at Lowes, Walmart, or just about any garden center. You soak one overnight in a gallon of water, and use the water to soak the soil around your plants where you are having the gnat problem. During the summer months, I keep a plastic gallon-sized watering can filled with water and a mosquito dunk, just in case.
HTH~
Renee

Beneficial nematodes work great on fungus gnat larvae. Use yellow sticky traps placed horizontally around houseplants for the adults.