The Gnats Came Back, So I Tried Stingmon Traps

The gnats showed up in April 2025, about three weeks after I repotted six plants on the card table in the garage. I am not going to blame the potting mix. I water on Sunday mornings whether the soil wants it or not, and that spring I had six fresh pots holding more water than the plants in them could drink. Warm house, wet soil, and a kitchen window full of small pots. That is the whole story. First I noticed a speck on the rim of the peace lily. Then another. Then one on the inside of my reading glasses.

My first try was a soil drench from the garden center, the kind you mix into a watering can. It helped. The gnats eased off for about three weeks, and then they were back. I had a half empty bottle under the sink and I never bought another one.

In May 2025 I ordered the 36 pack of Stingmon sticky traps. What came was a flat envelope of cards. Each one is about 5.2 inches tall and 3.15 inches wide, thin plastic, glue on both sides, and a sharp point at the bottom. You push the point down into the soil and the card stands up out of the pot. That is the whole thing. Nothing to plug in, nothing to assemble, and no instructions I could get wrong.

The first round I used six cards, one in each of the six pots I had just repotted. I set them near the edge of the soil, away from the stems so I would not spear anything. Inside of two weeks the cards were speckled and I was seeing one gnat a day instead of a small cloud over the snake plant. I also stopped watering on the dot every Sunday and started sticking a finger into the soil first. The cards did not do it alone, and I would not tell you they did.

Where I have landed, eighteen months later, is two cards out at any time. I swap them when they are full, about every four weeks, and the Stingmon pack lives in the kitchen junk drawer. I am a little over half through it. Two cards in a house with 24 plants sounds like nothing. It has been enough.

Inside of two weeks the cards were speckled and I was seeing one gnat a day instead of a cloud over the snake plant.

Two cards only works if they are in the right pots, and in this house that means the high ones. Pepper is nine and climbs, so anything on a low shelf belongs to her. The cards go in the pots on the kitchen sill and the high shelves in the living room, and the low pots go without. Biscuit is eleven and does not touch the plants, but he sheds, and I would just as soon not have a sticky card at his nose height. Keep them where your animals cannot reach them, and ask your vet about anything you are unsure of.

Two complaints. The cards are ugly, and there is no polite way to say it. A row of them across the kitchen window makes a sill of small pots look like a maintenance closet. The other complaint is that they grab. My sleeve, my hair, once the cuff of a sweater I had no business wearing while reaching over the fern. If you reach past a plant without looking, you will find out. I have taken to carrying a full card to the trash between two sheets of newspaper rather than on my fingers.

The listing has a note that warm summer temperatures can soften the glue, and I have seen that. In July the top edge of the card in the east window went tacky and collected dust along with the gnats. It still did its job. What the cards do not do is reach the larvae in the soil. They catch the adults that are already flying. That is why I stopped expecting a clean pot in three days. Fewer adults on the card, the soil drying out between waterings, and by June the kitchen window was quiet.

I still keep the drench in the back of my mind as the thing to try if the traps ever stop being enough. They have not. What the cards suit is a Sunday routine. Pull the full card, push in a new one, water the plants that want it, roll the fig four feet out from the window to vacuum under it. The card takes about a minute. It is the only part of plant care I have ever been consistent about.

One more thing about the pack. Thirty six cards is a lot of cards. If you have four pots, you will be handing them out to the neighbors. If you have two dozen, as I do, it is close to eighteen months of not thinking about gnats at all, which is worth something to me.

What I'd Tell You If We Were Sitting at My Kitchen Table

No card fixes wet soil. If the gnats came back three weeks after a drench, they will come back after traps too, unless you change how often you water. That is the part nobody wants to hear and it is the part that worked. Buy the pack if you want something you can see doing its job, something you push into a pot and forget about for a month. Do not buy it expecting the pot to be clear by the weekend, and do not expect it to touch what is already in the soil.

And put the cards where you can reach past them without knocking a fern onto the floor. That is all I know. The fig is still by the south window, the fern is on the old wooden stand the fig used to sit on, and there are two cards in the kitchen right now, one in the peace lily and one in a pothos. The gnats still show up every April. I am ready for them now, which is not the same as beating them, but it is close enough.