Venus flytraps are great plants to keep, but they're not effective for pest control, especially against tiny gnats. The gnats you have are probably fungus gnats and your houseplants' soil is infested with their larvae. To get them under control you have to innoculate the soil with nematodes that eat the larvae. The particular brand I got on Amazon aren't available anymore, but the species was s. feltiae and they worked really well. There might be other good or better nematodes, but that's how you get rid of the gnats.
this post was submitted on 19 Jul 2023
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Put ground cinnamon on your soil. It kills the larvae.
As far as carnivorous plants go, I have had more success with butterworts. Sundews are also good. Venus flytraps are considered harder to grow in general and harder to keep alive indoors without manual feeding.
Can confirm sundews, specifically the commonly found Drosera capensis is very easy to care for and should be good at catching bugs as long as they land on the tentacles
Chiming in to double confirm! Sundews/ Drosera/ "Death-by-lollipop-hugging" are super fun and cute and will go to war on insects. I've also had great luck with growing lowland and highland Nepenthes, tropical pitcher plants, indoors. Carnivorous plants are sometimes a little picky about temperature and humidity, especially the colder-climate ones that require dormancy periods, but there are some really rewarding and fairly forgiving ones.
Fixing my neighbor's trash can problem was what I needed to solve my fly infestation a couple summers ago, but my apartment bog ab-so-lutely racked up a ton of kills during the war.
Pro-tip: Carnivorous plants usually evolved in some nutrient-lean areas and can be pretty sensitive to the salts and minerals in tap water. A Total Dissolved Solids meter is cheap and helpful for double checking to make sure you aren't going to run into trouble. Some people don't have to worry about it, some do. I have a still for distilling water at home, lots of people rig up rain catchment systems, or buy reverse osmosis water at the store. There are options.
Thanks for the info! I ordered a sundew and I'm very excited for it to arrive.
No, not really. My VFT catches gnats but I don't think it would effectively reduce them overall.
There are a few practical management steps you can take as well to help reduce the gnat load.
Sand (washed playground sand as an example) as a mulch layer over the top of the potting mix will drain quickly and removes the gnat's preferred habitat for egg laying.
Bottom watering, while admittedly slower than pouring from the top, also helps to reduce the amount of time the top layer of soil is wet enough for them. Allowing the potting mix to dry thoroughly between waterings improves the efficacy of this practice.
Fungus gnats are generally the result of overwatering your plants. Let the soil surface dry out between waterings, and they'll disappear.
I've tried this and the answer is no. You really just need to get rid of whatever's attracting the gnats.