Trying to safely get rid of ants in your outdoor potted plants can be frustrating. This is a guide about getting rid of ants in outdoor potted plants.
Hardiness Zone: 9a
Jo from Louisiana
One of the best products I have found for keeping ants out of my flower pots (and my house) is diatomaceous earth (DE). Just sprinkle a tiny bit around the base of your pots or on the ants' "runs". It won't hurt your plants if you also want to spread a little on the topsoil.
I like DE because it is organic and it is safe. It contains nothing more than the powdered skeletal remains of tiny algae-like plants called diatoms (and maybe some water). DE is considered a mineral-based pesticide. It is made of up magnesium, silicon, calcium, sodium, iron, and several trace minerals. You can find it at garden centers, feed stores, and some health food stores, or order it online. DE is usually sold in 1-2 lb bags and has the look and feel of ground up chalk. I'm not exactly clear whether ants ingest it, or just perish as a result of coming into contact with it, but either way, it dries them up within about 30 minutes of exposure. The only caution about using diatomaceous earth is that you should not continuously breath any of the dust. Once you open the bag, you may want to store it in an additional bag to help contain the dust. I've used DE both indoors and out. I also have pets and have never had any problems, but like any pesticide, I restrict their contact with it. Always read and follow the label directions carefully.
Another organic method I've read about is scattering worm casings 1 inch thick across the topsoil of potted plants. Apparently, fire ants (and whiteflies) in particular don't care for this. I have not tried this method personally, but I like the sound of it. You are feeding your plants, while keeping troublesome bugs at bay. If you try it, let me know how it works. You can order worm casings online, get them from worm composters, or find them where organic garden products are sold.
I use epsom salts mixed with ground up orange peel that have been left in a jar overnight so the orange oil can soak into the epsom salts. Sprinkle it around any place you see ants and in ant mounds and they will move away quick. Here is the website I first found this on.
Would you consider planting mint in the pots? I planted mint in my garden at our old house to keep the ants out. Worked like a charm. But be careful, mint can and will take over your garden so it's best to plant mint in a pot.
My sister-in-law had a big ant bed in her potted plants and my father-in-law told her to use boric acid, it worked very well. The plants started growing like they were fed plant food.
I was recently in North Carolina where there were fire ant mounds everywhere. When I asked the person I was visiting how they rid the yard of the ants she told me something that may be helpful to you as well. Should you find any ant mounds in the yard, pour grits in and on the mound. When the grits get wet, it swells up and kills the ants. (or so I am told) Let me know if you try this and let me know if it works. I'm just interested.
I have a large pot outside with several kinds of plants in it, I just discovered it is full of small black ants. When I moved the pot, the ant "holes" were all under where the pot has been sitting for quiet awhile. Does anyone know how to get rid of these little devils without killing my plants or having to dump the entire pot? Thanks, any help would be appreciated.
Hardiness Zone: 8a
By Harden from NC
Sprinkle in a little cinnamon.
I have had good luck with cinnamon. Just sprinkle it on top of the soil and they should leave.
first I lifted up my plant and was grossed out. I've been spraying with HOT SHOT ant spray, so I soaked the ground with ivory and water then dawn with water and finally cinnamon. The cinnamon seemed to do it.
I wouldn't use cinnamon on the soil. I tried that and it killed my plant.
How do I get rid of ants in the soil of my outside plants on my patio?
By Brenda C from Clinton, NC
I place my plants in a large saucer or tub containing about an inch of soapy water, then flood the potting soil with a soapy-water solution (a little Dawn dishsoap in water). The soapy water will kill the ants, which can't get away because of the water in the saucer/tub. When the ants climb up the pot or up the plant, I spray the soapy water on them. But don't do this in sunlight because it can burn the plants. After the ants are dead, I spray clean water on the plants to remove the soapy water. I've never had a plant die, and I put all my plants out in early spring, each year. Sometimes, I'll water my plants with soapy water just to make sure they don't contain any ants before bringing them in. It's a cheap solution to an aggrevating problem.
hi susan my name is lanell I have red ants in my plant outside and im not sure how they got there but I just read your answer to my question but I have a question how long does this that for the plant to completely get out and how offend to I spray the plant thank you