Will an Open Salt or Sugar Jar on the Worktop Bring Ants in?

Both jars can pull ants onto a kitchen worktop, and in most homes the sugar is the more urgent lid. But the rule that ants come for sugar and leave salt alone is only dependable near the coast. A survey of 17 New World ant communities, sampled from 4 km to 2,757 km inland, found that the further inland a community sat, the harder it worked a salt bait.

What the folk rule misses is that neither pot is usually what started the trail. Ants take food as liquid, so dry crystals under a lid are not a meal until something wets them: a damp spoon, a splash off a pan, or room air past about 75% relative humidity. The Houseland cellar this question keeps arriving about is a speckled ceramic body with a bamboo lid holding about 300 ml per jar, and its listing states no seal of any kind - which matters less here than you would expect.

Do Ants Come for the Salt or the Sugar Jar in a Kitchen?

Sugar wins in most kitchens, but the margin shrinks the further you live from the sea, and well inland it can turn over. Michael Kaspari, Stephen Yanoviak and Robert Dudley put the numbers in PNAS in 2008. They set out vials of sucrose solution at 0.1, 0.5, 1, 5, 10 and 20 percent by mass, vials of sodium chloride at 0.01, 0.05, 0.1, 0.5 and 1 percent, and a distilled-water control, across 17 sites between 4 km and 2,757 km from the ocean.

Sucrose pickup, their proxy for how busy the ants were, peaked in the middle of that spread: the two highest recruitment figures, 66 and 68 percent of vials, came from sites 10 to 100 km inland at the 10 and 20 percent sugar strengths. Salt did something else entirely. The maximum share of NaCl vials worked rose with distance inland (y = 3.8x^0.25, r-squared 0.35), and so did the ratio of salt pickup to sugar pickup (r-squared 0.26). The full paper is open access if you want the scatter plots.

Kaspari's own gloss on the result is blunter than the paper. Past roughly 60 miles (100 km) from the coast the preference starts to show, and in Oklahoma he recorded carpenter ants taking sodium chloride over sugar. He also makes the point that a Pecan Sandy shortbread biscuit is such a dependable ant bait not only for its fat and sugar but because it is one of the saltiest biscuits on the shelf.

Why Would an Ant Want Salt at All?

Sodium is a nutrient an ant cannot make for itself, and rainfall delivers less of it the further you go from the ocean. That is the mechanism the paper proposes. Sea spray puts sodium into rain, the rain drops most of it on the land nearest the coast, and inland plants grow up sodium-poor. An ant living on nectar, honeydew and plant sap therefore takes in carbohydrate by the crop-load and almost no salt.

The diet split shows in the figures. Genera classed as herbivores and omnivores used salt relative to carbohydrate at a ratio of 8.7, against 1.5 for the carnivorous genera - about six-fold. At subfamily level the gap widened to 6.9 against 0.75. Communities sitting in forest litter, where dead insects are a sodium supply of their own, worked the salt vials less than communities surrounded by living vegetation.

So a sugar-feeding ant is not indifferent to an open salt cellar. It is short of precisely what is in it. The colonies most likely to work a salt pot are the same ones the sugar-only advice was written for.

Does That Study Say Anything About My Worktop?

No, and it is worth saying plainly: there is not one kitchen, house or building anywhere in the paper. It is field ecology. The baits were Eppendorf vials half-stuffed with cotton soaked in solution, opened and laid one every 3.3 ft (1 m) along four or five transects, left out for an hour, then shut and counted. A score was the percentage of 15 vials with ants in them, minus whatever turned up at the water control.

Two limits follow. The strongest salt bait was 1 percent sodium chloride by mass, which is a weak brine and not a crystal; what sits in a cellar is a hundred times more concentrated and, more to the point, dry. And ants feed on liquid - a forager fills its crop and hands the load to nestmates by trophallaxis - so a heap of dry grains is not something a worker can carry home.

Put those together and the honest claim is a narrow one. An open salt cellar is a plausible attractant once the salt is damp, not a demonstrated one, and the study explains the appetite rather than the trail on your counter. A wet teaspoon dipped back into the pot does more to make that salt available than an open lid ever will.

Salt Jar vs Sugar Jar: Which Lid Should You Close First?

Close the sugar. It is what the colony is recruiting for across most of the country, and it is also the one of the two that is spoiled by being left open.

Past roughly 60 miles (100 km) inland, stop treating the salt as the harmless one of the pair. That is a hierarchy worth dropping, not because salt is suddenly the bigger draw, but because the reason it was dismissed - ants only want sugar - turns out to be a coastal observation dressed up as a rule.

How Do You Clear a Trail That Is Already Running?

Break the chemistry first, then go looking for the way in. Foraging ants lay a scent trail that recruits the rest of the shift, so the line you can see is a signpost as much as a queue. The University of California's Pest Notes on ants sets the order out.

1. Lift the line with a sponge and soapy water, which takes the scent trail away along with the ants. Spraying it kills the walkers and leaves the chemistry on the surface.
2. Do not expect an indoor spray to stop entry, because it only reaches the small share of workers that are out foraging. The queen and the brood are somewhere else.
3. Set bait, then leave it undisturbed for 5 to 10 days before judging it. A bad case can take several weeks or more to finish.
4. Clear every competing crumb, because bait only works where nothing else is on offer. Iowa State Extension is explicit that sanitation is what makes baiting work at all.
5. Match the bait to the ant: Argentine ants (1/8 in, dull brown) go for sweets, pharaoh ants (1/16 in, honey-coloured) take fats and proteins as well, and carpenter ants run 1/4 to 1/2 in.

Then take the pot out of the argument altogether. Keep one dedicated dry spoon with the jar, so a wet one never goes back into the crystals. The Houseland cellar's spec lists a 3.2 in (8.2 cm) spoon per jar and a speckled ceramic body 4.1 in (10.5 cm) wide and 3.6 in high; it publishes no gasket, no seal and no airtight figure at all, and you should not read one into a bamboo lid.

Is There a Better Reason to Keep the Lid On?

Yes, and it has nothing to do with insects. Salt left in open air begins dissolving in the moisture around it once relative humidity crosses 75.29 percent at 77 F (25 C), a value re-measured by dynamic vapour sorption at the Technical University of Denmark and published in ACS Omega in 2021. Below that line the crystals barely register the air; above it they wet, then dry into the crust you have to break with a spoon handle.

Sugar has no such threshold to shelter behind. Utah State University Extension's guidance on storing sugars says moisture makes granulated sugar hard and lumpy and that there is no easy method to restore it, and that the roughly 2-year best-if-used-by date on a bag is about that lumping rather than spoilage, since sugar resists microbial growth indefinitely. The same page tells you to keep it cool and dry and out of the refrigerator, which is cold and damp - the opposite trade.

The lid has a third job people forget: it is a natural material sitting over food, and bamboo behaves like wood rather than like glass. That is the same question we worked through for coconut bowls and food safety, where the answer came down to drying rather than scrubbing. If you want the humidity half of the argument applied to a wet room instead of a kitchen, textured wall art in a bathroom turns on the same band of numbers.

From the shop

Salt Cellar With Spoon, Ceramic Seasoning Jar With Bamboo Lid

Houseland's salt cellar is a speckled ceramic body with a bamboo lid, about 300 ml per jar, 4.1 in (10.5 cm) wide and 3.6 in high, with a 3.2 in (8.2 cm) spoon. Choose 1 Jar, a 2 Jar Set or a 3 Jar Set.

View the ceramic salt cellar — 3 set sizes & current price

What I'd do

Close the sugar first, then stop treating the salt as inert, then spend the rest of the effort on the path rather than the pots. In that order.

• Lid on the sugar at every use - the moisture damage is real and there is no easy way to reverse it.
• Lid on the salt as well if you are much more than 60 miles (100 km) from the sea, on the grounds that the appetite is documented even if the kitchen trail is not.
• One dry spoon that lives with the jar, never a wet teaspoon out of the drawer.
• Sponge and soapy water down the whole visible run, not an aerosol.
• Bait where the ants enter, and give it 5 to 10 days before you decide it failed.

If you live well inland, sealed the sugar and left the salt open, you have done about half the job. The 17-community result does not prove your salt cellar summoned anything, but it removes the reason you had for ignoring it. The rest of what we keep out on a worktop sits in the kitchen and home collection.

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