Ants in the Garden This Summer: Here's Why That's a Good Thing

(Image credit: Greenseas)

When you spot ants streaming across your garden path or disappearing into cracks in the soil, it's easy to see a problem. But garden ants are quietly doing a long list of useful things that most of us never notice. Before reaching for anything to get rid of them, it's worth knowing what they're actually contributing to your garden.

They Improve Your Soil

Ant colonies dig extensive tunnel networks underground. All that excavating loosens compacted soil, improves drainage, and aerates the root zone of your plants. Research has shown that soils with active ant colonies have better water infiltration and more air pockets than ant-free soils - conditions that plant roots benefit from directly.

The soil they bring to the surface when digging is also enriched with organic material from deeper layers. An ant mound might look untidy on a lawn, but it's essentially a small pocket of improved, aerated soil.

They Help Break Down Organic Matter

Ants are efficient decomposers. They collect dead insects, plant material, and other organic waste and bring it underground, where it breaks down and returns nutrients to the soil. This is part of how garden ecosystems cycle nutrients - a chain that feeds plants, which feed insects, which feed birds.

They Spread Seeds

Many plants have evolved seeds with a small fatty attachment called an elaiosome - essentially a food reward for ants. Ants carry these seeds back to the nest, eat the fatty part, and discard the seed nearby, often in nutrient-rich soil near the colony entrance. The seed gets planted with a head start. This process, called myrmecochory, is responsible for the spread of dozens of plant species including violets, celandines, and many wildflowers.

They're Natural Pest Controllers

Ants prey on a range of garden insects. They hunt caterpillars, beetle larvae, and flies. A colony of black garden ants (Lasius niger) foraging across your vegetable patch is quietly removing pests you might never notice. The relationship with aphids is more complicated - many ant species farm aphids for their honeydew while protecting them from predators - but even so, the overall balance tends to benefit a healthy garden.

When Garden Ants Become a Nuisance

There are situations where ants cause real problems - nesting in a raised bed and disturbing plant roots, building large mounds in the middle of a lawn, or nesting close enough to the house that they find their way indoors in summer. In those cases, gentle redirection makes sense. We cover the best animal-friendly methods for keeping ants out of the home in How to Ant-Proof Your Home Without Harming a Single Ant.

If a nest is in an inconvenient spot, you can sometimes encourage the colony to relocate. Place a large flat stone or wooden board a meter or two away in a warm, sunny position. Ants are attracted to heat and will often start moving the brood to the new warm spot over a few weeks. Gently disrupting the original site at the same time can nudge the process along.

A Different Way to See Them

Ants have been running their colonies for over 100 million years. The species you see in your garden - most likely Lasius niger, the common black garden ant - is the same species that many people start with when they get into keeping ants as pets. They're fascinating, hard-working animals doing something genuinely complex under your feet. The goal in summer isn't to get rid of them - it's just to negotiate where the boundary is.