Ants in Your House? Try Borax, and Avoid Pesticides
Oh, heavens to Murgatroyd, I have found some ants in my metaphorical pants. I refuse to use poisons around my place, as I have cats and another person to worry about. Also, I tend a small vegetable garden so the idea of spraying something out of New Jersey around my peaceful and organic Oregon garden and yard fills me with abject fear.
So, I have done a little digging and this is what I found.
Did you know that Queen Elizabeth I used borax to bleach her skin to she could be/stay so virgin-ly white? I learned that on Jeopardy years ago.

There is a good reason that no plants are growing here.
But also and more to the point today, borax can be used as an ant killer, or deterrent. However, please note that too much borax can be just as dangerous as any other pesticide, so use wisely.
Borax is the salt of boric acid, and boric acid is known as a great way to kill things like roaches. Borax and boric acid does kill plants, so this borax trick shouldn’t be used directly in the garden.
If you mix equal parts borax powder (20 Mule Team brand borax is 99.5% straight borax and thus a good choice) with sugar, you can make a clever little drink for ants that will kill them and drive them from your house. This is the basis of the Terro ant bait/killer that is available commercially.
You can also sprinkle a little borax around the door frame to be even more uninviting to ants, but obviously, if you have kids or pets, this may not be a good idea.
There are other variations on this Sugar and Borax recipe. I found some of these tweaks on the Garden Web forum here.
Obviously, if you take care, you can avoid having to go so far as to kill ants. Keeping your kitchen clean is the best way to avoid an ant problem. Also, when you do clean around your house, use white vinegar and borax. Both options are great little cleaning agents, so this is an easy way to “go green,” per se, but also, ants don’t like the acid in vinegar and the borax will kill them. So, you see how this works. Use cleaning products that ants hate and the ants won’t hang out at your house.
Ants in the actual garden? Remember borax is technically an herbicide (that’s what makes it such a kickass cleaner, kind of like bleach — also technically an herbicide). You can try my coffee ground trick. Or go with diatomaceous earth (which is just crushed up seashells) which will kill the ants by dehydrating them from the inside. Gruesome, I know. Don’t they say that most serial killers start out by killing insects or small animals?
Ants are also adverse to other smelly things like cloves, cayenne, mint, lemon or orange oil, so you can always experiment and discover your own recipe for keeping those ants at bay.
Or plant herbs like mint or tansy to further make your garden and home uninviting.
Whatever you do, don’t buy and use products like Raid or any other pesticide that clearly states that whatever is inside the bottle is extremely dangerous to your health, your child’s health, your pet’s health, your soil’s health, the water’s health, the air’s health…
Ants, Oregon, house, borax, boric acid, organic, natural, deterrent, pesticide, herbicide, sugar, diatomaceous earth, mint, cayenne, tansy, 20 Mule Team, Terro, Raid, health
November 28th, 2008 at 7:52 pm
Nice and usefull post, thanks, this is one for my bookmarks!
December 20th, 2008 at 1:56 pm
I suppose renting an anteater is not an option?
December 20th, 2008 at 11:32 pm
Ha, Obbop, if only…
June 18th, 2009 at 6:58 pm
I’ve heard about the sugar/borax mix. I don’t think borax is a deterrent though. I think it actually kills them.
I also think they will eat Borax all by itself. I never add sugar. I just sprinkle some borax along the baseboards and in their trails. It could be that they pick up enough of it just by crawling through it.
I had a nest in the yard and ants in the kitchen this spring. Both are dead. Takes about one or two weeks for it to work.
August 10th, 2009 at 12:58 am
Hi, Lulu
Technically, diatomaceous earth, is not ground seashells. They are dead diatoms, a hard-shelled algae. Razor-sharp to many insects, it kills by cutting the bodies when they pass over them. Pests lose body fluid and die. Otherwise…great post. Here in Canada, we use maple syrup with Borax. What else WOULD we use? ha Thanks for taking the time to post your solutions!