Ghost ants are one of the trickiest household ants to eliminate, but natural methods can work if you understand how these colonies operate. The key is using non-repellent strategies, because spraying ghost ants with anything that scatters them will make your problem worse. These tiny ants have multiple queens per colony and respond to threats by splitting into new colonies throughout your home, a behavior called budding. A successful natural approach combines slow-acting baits that reach the queens, physical barriers, and habitat changes that make your home less inviting.
Why Sprays Backfire With Ghost Ants
Before trying anything, you need to understand the one rule of ghost ant control: never spray them with repellent products, including most essential oil sprays, directly on active trails. Ghost ant colonies contain dozens of egg-laying queens. When workers sense a chemical threat, groups of workers grab eggs and queens and leave to establish new colonies elsewhere in the building. A single small infestation can turn into a building-wide problem this way.
This is why the most effective natural approach is a bait that workers carry back to the nest without detecting any danger. You want to feed the colony, not frighten it.
Identifying Ghost Ants
Ghost ants are extremely small, only about 1.3 to 1.5 mm long. Their head and upper body are deep dark brown, while their legs and lower abdomen are milky white, almost translucent. That pale coloring is what makes them look “ghostly” and hard to spot on light surfaces. If you crush one, it gives off a smell similar to rotten coconut.
They nest in surprisingly small spaces: wall voids, gaps between baseboards and cabinetry, cracks between books on a shelf, and potted plants. Outdoors, they favor flowerpots, loose bark, the bases of palm fronds, and tufts of dead grass. Ghost ants strongly prefer sweet foods like sugar, cake, and syrup, though they also scavenge dead insects and collect honeydew from aphids and other sap-sucking bugs on your plants.
Homemade Borax Bait for the Colony
A low-concentration borax or boric acid bait is the most effective natural weapon against ghost ants. The concentration needs to be low enough that workers survive long enough to carry the bait back to the queens and brood. Too strong, and workers die before sharing it, which accomplishes nothing.
The University of Hawaiʻi recommends this liquid sugar bait recipe:
- 1 teaspoon boric acid powder
- 3 tablespoons white table sugar
- 1¾ cups warm distilled or bottled water (avoid tap water)
Stir until completely dissolved. Soak cotton balls in the solution and place them in shallow containers near where you see ant trails, especially along baseboards, countertops, and near sinks. Ghost ants prefer sweet liquids, so this formula targets their natural feeding habits. Replace the cotton balls every two to three days, and keep placing them as long as you still see foraging ants. It can take one to three weeks for the bait to work through a colony with multiple queens.
Keep boric acid baits away from areas where children or pets can reach them. While boric acid is a naturally occurring mineral, it is not safe to ingest in concentrated amounts.
Diatomaceous Earth for Entry Points
Food-grade diatomaceous earth works as a physical insecticide rather than a chemical one. Under a microscope, the particles look like broken glass. They cut through an ant’s exoskeleton and absorb its body moisture, causing dehydration and death. This makes it useful for treating cracks and entry points where ghost ants travel, but it should complement your baiting strategy, not replace it.
Apply a thin line of food-grade diatomaceous earth along baseboards, window sills, wall cracks, and any gaps where ants enter. Use it only in dry areas, since moisture makes it ineffective. Wear a dust mask during application. The powder can irritate your lungs if you inhale a significant amount, even though it is not chemically toxic. Do not use pool-grade diatomaceous earth, which is a completely different product and is extremely toxic.
The important nuance: apply diatomaceous earth at entry points and nest openings you’ve identified, but not directly across active foraging trails where ants are heading toward your bait stations. You want foragers to reach the bait and carry it home.
Using Essential Oils as Barriers
Clove oil and peppermint oil can deter ghost ants from specific areas, but they work as repellents, not colony killers. In one controlled study, a food source protected by cloves attracted only 5 to 13 ants over three hours compared to 30 to 100 ants at an unprotected food source. That is a meaningful reduction, and the repellent effect lasted several hours.
The right way to use essential oils alongside a baiting program is strategically. Mix 15 to 20 drops of peppermint or clove oil per cup of water in a spray bottle and apply it to areas where you do not want ants foraging, like pantry shelves, fruit bowls, or pet food stations. This pushes ants away from your food and toward your bait stations instead. Do not spray oils near your bait placements, or you will repel ants from the very thing you need them to eat. Reapply every day or two, as the oils lose potency quickly.
Cutting Off Food and Water Sources
Ghost ants can sustain a colony on remarkably small amounts of food. A thin film of syrup on a countertop, a few grains of sugar near the coffee maker, or a sticky spot on the floor can keep them coming. Wipe down kitchen surfaces with white vinegar after cooking. Store sugar, honey, and syrups in sealed containers. Rinse dishes immediately rather than leaving them in the sink, and empty pet food bowls overnight.
Moisture matters as much as food. Ghost ants need water, and they commonly nest near plumbing. Fix leaky faucets, dry out the area under sinks, and reduce any standing moisture in bathrooms and kitchens.
Sealing Entry Points and Modifying Habitat
Ghost ants exploit tiny cracks and gaps to move between outdoor nests and your kitchen. Seal crevices around windows, doors, baseboards, and where plumbing or wiring penetrates walls. Silicone caulk works well for most of these gaps.
Outside the house, the UC Integrated Pest Management Program recommends keeping vegetation, mulch, leaf litter, and irrigation water at least several inches back from your foundation. Prune shrubs and tree branches that touch or overhang the building, since ants use these as bridges. If you have potted plants near doorways, check them for nests. Ghost ants readily colonize the soil in flowerpots, and moving an infested pot indoors is one of the most common ways they enter a home.
Plants that host aphids, scale insects, or other sap-sucking pests near your home’s exterior create a honeydew buffet for ghost ants. Removing or treating those plants reduces the food source that draws colonies close to your walls in the first place.
Putting It All Together
The most effective natural approach layers these methods in a specific order. First, set out liquid borax baits along active trails and near suspected nest sites. Second, use essential oil barriers to protect your food while leaving bait stations accessible. Third, apply diatomaceous earth at confirmed entry points. Fourth, seal cracks, clean rigorously, and modify outdoor habitat to prevent reinfestation. Expect the process to take two to four weeks, since you are waiting for boric acid to cycle through a colony with multiple queens. If you see new trails forming in different areas during the first week, that is normal. The colony may shift before it collapses. Resist the urge to spray anything, and keep the bait stations fresh.