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Your cart is empty.The best defense against Mother Nature is Mother Nature. Meet STEM Kills Flies, Mosquitoes and Gnats � a bug spray for home and outdoor use made with botanical extracts that are safe for you, but deadly for bugs. STEM�s scientists decode the power of nature, scientifically optimizing it into effective bug-fighting forms. STEM plant-based active ingredient bug spray is formulated with botanical extracts to kill flies, mosquitoes and gnats. Our insecticide is safe for use around people and pets (when used as directed) and was tested by entomologists. It has no added dye, fragrance, or harsh chemical odors and is made for indoor and outdoor use. STEM helps protect your family. Rooted in Nature, Optimized by Science.
BEV
Reviewed in the United States on March 2, 2025
I purchased this Stem spray because I had a lot of gnats in my house even though I had no plants or fruits. Though the spray is very effective for getting rid of flying gnats, there was a lot of oil all over my tiles and furniture. It says to shake the can first, which I did but still that's way too much oil on everything. Not worth it to have to mop floors, and wipe down furniture every time.
Katherine
Reviewed in the United States on February 20, 2025
My cat accidentally licked some of it and he wasn’t harmed. Obviously before buying I read reviews to make sure others pets didn’t end up harmed or dead. I wouldn’t spray a large concentration on a single spot either but it should be fine.
Elena W
Reviewed in the United States on February 14, 2025
I’ve been using the Stem Bug Spray, and I’m really impressed! It effectively keeps flies, mosquitoes, and gnats away, both indoors and outdoors. I love that it’s plant-based and safe to use around my family. Plus, the scent is light and not overpowering like most bug sprays. Highly recommend for anyone looking for a natural, effective solution!
Aldana Galina
Reviewed in the United States on February 10, 2025
I love this product! The quality is excellent, and it works just as promised. For the price, it’s a great deal, especially considering it’s made with plant-based ingredients. It arrived in perfect condition, well-packaged with no leaks. The effect is immediate—it kills flies, mosquitoes, and gnats quickly without a strong chemical smell. I appreciate that it’s safe for indoor and outdoor use. Highly recommend!
Dave
Reviewed in the United States on January 5, 2025
So, I gave this Plant-Based Bug Spray a shot because, honestly, bugs are the worst, but I hate using sprays that smell like a chemical lab exploded. This one stood out because it's made with plant-based ingredients, which felt like a win for my home and the environment.🦟 The Good Stuff:It Works! I used it indoors and outdoors, and it actually kept flies, mosquitoes, and gnats away. It didn’t just knock them out—it kept them from coming back for a while.Smells Pretty Nice: No overpowering chemical stench here. The botanical scent is fresh and natural, kind of like walking through a garden.Pet-Friendly Ingredients: With two dogs running around, I feel better knowing I’m not spraying harsh chemicals near them.Versatile: Works great for random indoor fly invasions and keeping bugs off the porch during hangouts.🤷♀️ What Could Be Better:Short-Term Fix: While it’s great at getting rid of bugs on the spot, it’s not a long-term deterrent. You’ll probably need to reapply if you’re outside for a while.Spray Design: The bottle is functional, but the spray could have a finer mist for better coverage.🚪 How It Stacks Up:Compared to standard bug sprays, Stem is a great alternative if you’re looking for something plant-based and effective without the toxic vibes. It doesn’t have the crazy strength of DEET-heavy sprays, but for everyday use, it’s solid.If you’re like me and want to keep the bugs at bay without dousing your space in chemicals, this is definitely worth a try. Just keep it handy for re-sprays during longer outdoor hangs. 🌿✨
Tara Waszcyszak
Reviewed in the United States on January 29, 2025
I’m so mad I didn’t read the reviews first. Yes, the spray kills the bugs but IT. STAINS. EVERYTHING. I had a houseplant that must’ve had fly eggs in it so a bunch hatched in the house. We have to repaint our ceiling and walls because the spray oil stained them so badly everywhere.
CinemaDude
Reviewed in the United States on September 25, 2024
One of our screen had a hole that I didn't notice and hence 4 or 5 flys had made their way in. They were bothersome enough and numerous enough that I thought, time to get some fly spray and be done with them. So here comes Stem Fly Spray and I think, great, this will finish them off in short order -- just spray it around the area where the flies are and the deed will be done. Oh, not so fast, compadre; read the instructions carefully and there you will see that they want you NOT to spray this stuff up in the air -- it specifically says not to. WHAT!? thinks I. No, you are supposed to wait till a fly LANDS and then spray it DIRECTLY on the fly holding the can 18 inches away, it says. Problem with that is, flies are WAY quicker than the spray -- the spray never hits them because they are gone the microsecond after you press the spray button. Evidently they see the spray COMING and they are gone, zippity-split, before it even gets to them! Plus, half the time when you try to get get the spray can 18 inches to a landed fly, that speedster is GONE, just from your movement. They are not just sitting there waiting for you to spray them. I have not been able to kill a SINGLE FLY in at least a dozen tries or more for over two days. Not singe success!I GURANTEE you will be better off with a fly swatter than this product. Better still, find a fly spray that you actually CAN spray in the air where the flies are, you know....flying. Also, this stuff is GREASY...every surface I sprayed it on in my attempt to get of a landed fly (which, btw, they don't do that often) turned into a greasy mess that then had to be cleaned, so that makes it a no-go for a fly that lands on any porous surface...like most of what is in my house. This stuff is a FAIL on many levels.
UptownGem
Reviewed in the United States on June 4, 2024
Spray the bugs 1-2xs. They might fly around for another minute or two but you’ll come back to them dead on the floor. We are opening our pool back up for the summer , which meant we had a lot of work men run in and out our garage , well this lead to someone leaving the door from the garage to the house open and we had so many flies get In ! I started spraying them with this and got frustrated as they were still flying away but when I came back in the room 2 minutes later most of them were dead on the floor ! It’s been 2 days and all the flies are gone . My only draw back is this stuff is sticky and slippery and leaves a residue that you have to wipe up /mop up well to get off your surfaces .
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