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Nematodes.
You can get them online and water then into your plants. They don't harm the plants, but will eat the gnat eggs in the soil before they get out and start becoming a nuisance.
The effect takes time and consistent applications, but will make for a substantial reduction in gnats.
I watered everything 1x/week with exclusively nematode water for like a month and the gnats were scarce by the end of the month.
Will definitely look into this. Thanks for sharing!!!
Bowl Leader
Peroxide soak. Doesn't hurt the plant and kills off a lot of gnats
Thanks! I always give Mosquito Bits a try but it's only for fungus gnats. I'll give this a shot next time I have any around.
Oh my goodness. This is gross but also satisfying to see.
Right!
If they are fungus gnats specifically (look up how to ID them), Mosquito Bits can be mixed with water to kill them in potting soil (like the nematode suggestion, but bacteria instead of a worm) and are a lot cheaper due to being shelf stable. It won't do jack shit against any other kind of gnat though, so make sure you have the right kind (they're very common though so there's a good chance).
Nematodes are effective against a much broader range of species.
Just be careful if you reuse soil or have pets.
For fungus gnats you can add something called systematic granules to the soil - they work similar to mosquito bits. You can sprinkle them on top of already potted plants, they last about six months. I always add some to soil whenever I’m repotting now. I have very few gnats.
Yep, and it's a good recommendation for indoor, non-edible plants! I just wanted to make sure OP was aware of the flip side of it in case those plants were a kitchen herb garden or sometimes went outside.
Thank you ALL for your tips and tricks.
I found the source in a place not so frequently mentioned — the fridge grill! I admit I do bi-weekly wipes of the inside but hadn’t cleaned the grill in some time, weeks for sure.
I assumed it was the plants but found it super odd to have that drastic an increase of gnats in the trap.