Stingmon Review: Months of Everyday Use

Fungus gnats do not care how long you have been keeping houseplants. In April 2025 I repotted six plants over one weekend on the card table in the garage, carried them back inside, and watered them on schedule the way I always do on Sunday mornings. By the first week of May there was a small gray cloud lifting off every pot in the living room. I am 67 and retired and I have had plants in this house for thirty years. It was still the worst gnat spring I can remember.

I bought the Stingmon yellow sticky traps in May 2025, a 36 pack, and I have had two of them sitting in pots ever since. That is eighteen months of use as of this month. I am going to be straight with you about it, because when I was shopping I read a pile of reviews that stopped at 'it works' and not one of them told me what the first month would look like. The traps worked. They also did not fix the problem on their own, they do not catch everything, and I have two complaints that have not gone away in a year and a half.

How I've Used It

Before I opened the pack I did the thing I do now with everything, which is read the listing through twice. It says plastic, it says manual power source, which is a fussy way of saying there is no battery and nothing to plug in, and it says the traps go into the soil. What it does not say is how much of the trap stands above the soil line once you push it in, and the answer is most of it. The pointed bottom goes down maybe an inch and a half into the dirt and the rest stands upright out of the pot. That surprised me. I had pictured something lying flat on the surface.

The Stingmon pack arrived in May 2025 and I put six traps into six pots that same afternoon: the fiddle leaf fig in the living room, the snake plant, the Boston fern, a pothos on the kitchen sill, and two of the smaller pots on the high shelves. The bottom of each one is pointed enough to push straight down into the soil, so there was nothing to assemble and nothing to read twice. Dual-sided means both faces are sticky, which mattered more than I expected, because gnats do not always come at a plant from the same direction.

Two weeks in, the traps themselves were the clearest evidence I had. The count on the surface told me the population was dropping before my eyes told me. I want to be careful here, though, because I did two things at once. I also let the top of the soil dry out further between waterings, which is the part nobody wants to hear. The traps alone did not do it. The traps plus a drier Sunday did.

Since then the routine is two traps at any one time, in the pots the gnats like best, swapped out when the surface is more speck than trap. That works out to roughly every four weeks. Half the pack is still in the kitchen junk drawer. Traps only go in pots on the high shelves and the window sills, out of reach of Pepper the cat and Biscuit the dog, because Pepper climbs anything with a lip on it and Biscuit's tail clears a coffee table without trying.

Eighteen Months of Swapping Them Out

A trap is done when what you can see is mostly speck. In the living room pots mine run about four weeks. The one that used to sit on the kitchen sill went closer to six, where the air moves more. There is no cleaning and no reset. You pull the old one out, drop it in the bin, push a new one into the same hole, and go water something else. The whole job is a minute, and I have done it while holding a watering can in my other hand.

Where they go matters more than I expected. My first round went into six pots across the living room and the kitchen sill, and the two that filled fastest were the fern and the pothos, which are also the two I water heaviest. The snake plant's trap filled so slowly that I stopped putting one in it after the first month. Whatever is going on inside that heavy pot, it is not hosting a gnat nursery, and I would never have known that without a clean trap sitting in it for four quiet weeks.

The pack arithmetic is the part that surprised me. Two out at a time, swapped about every month, is 24 traps a year, so the Stingmon 36 pack should run a little past a year and a half. I am into November 2026 and there is still half a pack in the drawer, which means I have been slower to swap than my own math says. Some pots simply do not fill up once the soil dries properly between waterings.

Mine stay indoors. The listing covers indoor and outdoor use, and I have never tried them outside. Inside, each trap goes toward the back of the pot, behind the plant's own leaves, where it is least visible from the sofa. That is as much for my eyes as for anything else.

What They Catch, and What They Cannot

The listing says these catch fungus gnats, whiteflies, blackflies, thrips, fruit flies, midges, mosquitoes and other flying insects. In my house the catch is gnats and the occasional fruit fly drifting in from the kitchen, and I have no reason to doubt the rest of that list. What they do not catch is anything that has not taken wing yet, and that is the whole limitation in one sentence.

I kept a rough tally that first summer, out of curiosity more than science. The trap in the fern was the busiest by a wide margin, and the two on the high shelves were nearly bare, which lines up with the shelves getting less water and more moving air. It also lines up with the fact that I can barely reach those shelves, so those plants get a lighter Sunday than the ones at eye level. If you want to know which of your pots is the problem pot, this is an easy way to find out without guessing.

Each trap measures about 3.15 inches wide by 5.2 inches tall and is thin, and the full pack weighs 1.12 ounces. That sounds small, and it is. Which is exactly why six of them spread across six pots in one room made such a difference in the first two weeks. Density does the work. A single trap in the far corner of a big room is decoration.

The larvae are the piece the trap cannot reach. They live in the top inch of damp soil and hatch out over weeks, so if all you do is hang traps, the gnats come back around and you blame the traps. I let the surface dry between Sundays now, and I have not had a real bloom since the summer of 2025. If your soil stays wet longer than you expect after repotting, the traps will tell you so, one generation at a time, and that is more information than I had for the first thirty years of doing this.

The Soil Drench I Tried First

Before the traps I did what the garden center counter suggested and bought a gnat soil drench. One bottle, no brand worth naming here, applied once in April 2025 exactly as the label said. The gnats eased off within a week and I thought I was finished with it. They came back about three weeks later, in about the same numbers. That bottle is still on a shelf in the garage and I have not opened it since.

What that bottle did teach me is that the population lives somewhere, and it is not the air. It went into the top of every pot and the gnats eased within a week, which told me the soil was the factory. When they came back three weeks later in the same numbers, it told me the factory had simply restarted. The traps were the first thing that showed me that factory running, generation by generation, and that is why I trust them more than the bottle even though the bottle acted faster.

I will not tell you the drench was worthless, because it did knock them back. What it did not do was hold. The traps are the opposite sort of thing. They knock nothing back, they simply take the adults that are flying right now, every day, and they never stop taking them. Between the two, the boring one is the one still sitting in my pots eighteen months later.

Two Annoyances I Have Not Solved

The first is that they grab. Reaching past a trap to water the plant behind it means a sticky edge catches the sleeve of whatever I am wearing, and one afternoon it caught my hair. I have learned to water from the other side. I have not learned to stop wearing long sleeves in the living room, so we are at a standoff.

The grab has a cost I did not expect, and it is not the sleeves. A trap that has been in a pot for three weeks is full, and the full part is still sticky. Pulling one out means getting a thumb on a face that is already covered in gnats, which is exactly as pleasant as it sounds. I have taken to using the corner of a paper towel and pulling straight up. That is a small thing, but it is a thing I do now that I did not do in May 2025, and nobody mentioned it to me beforehand.

The second is that they are ugly. There is no polite way to put it. A potted plant with a yellow rectangle sticking out of the soil looks like a potted plant with a yellow rectangle sticking out of the soil, and eighteen months has not made me like it. My compromise is the back of the pot, and I have never put one in the fig, which sits where people actually look when they walk in the door.

One more thing worth knowing, straight off the listing: when temperatures rise in summer, the glue can soften. Rochester does not give us much of that, but the trap in the kitchen window looked glossy and tired by July. It still caught gnats. I swapped that one a week early and did not think about it again until I sat down to write this.

Six traps in six pots, two weeks, and the cloud over the living room was gone. The larvae in the soil were not.

Who This Is For

You repotted something in spring and you have been swatting at the air ever since. You water on a schedule because that is how you remember to do it, and you want something that takes a minute a month and no mixing, no spraying, and no reading a label with a flashlight. That is exactly who this Stingmon pack suits, and it is why I bought it.

It also suits anyone who would rather see the problem than guess at it. A trap tells you what is flying and, when the surface stays clean week after week, it tells you that too. That is information I did not have for three decades of keeping plants, and it changed how I water more than any advice ever did.

Who Should Skip It

Skip it if you want the larvae gone by Friday. These will not do that, not on their own, and if you are not willing to let the top of the soil dry between waterings, you will be buying traps forever and blaming them for it. I would rather tell you that now than have you find out in July.

Skip it if a yellow rectangle in a pot would bother you more than the gnats do. That is a real trade and I would not talk anyone out of it. And skip it if your plan is to set them at floor level around a cat that climbs or a dog with a happy tail, because the glue does not know the difference between a gnat and a whisker, and neither does a vacuum.