Pests & Diseases of Lawns,

How to get rid of ants in the garden (the humane way!)

Ants can be a pest but they're actually quite a valuable asset in your garden. Find out why in this article.

14 MIN 03 Jun
Last update: 03 Jun 2022
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For some, just the thought of ants makes them start itching. And while these little tiny insects CAN feel like a pest when they infringe on the house,  ants are fascinating creatures that may actually benefit your garden’s natural defences against pests. However, you’re reading this article to find out how to get rid of ants in the garden, so we better not disappoint. 

Ants can damage your lawn, but they can also protect your garden’s plant life from more damaging lawn-munching critters, such as chafer grubs and leatherjackets. But if your grass plants are taking a hit, it might be time to learn how to control them. 

But don’t run out into the garden with a kettle of boiling water like your mum in the 80s quite yet. This article will explore the benefits of ants in the garden and explain how to get rid of them if they’re causing problems. 

So, get comfy and try to stop scratching. 🙂

Ants in your garden: how to get rid of them

What are ants?

Close up of an ant
An ant – Photo by Witsawat.S on Shutterstock

Ants are tiny six-legged insects that live in vast underground colonies, ruled by a single queen. There are tens of thousands of species of ant across the globe, with fifty found in the British Isles, but the most common varieties found in the UK are:

  • Black/garden ant 
  • Yellow Meadow ant
  • Red ant
  • Red Wood ant/Horse ant
  • Black Wood ant
  • Black stinging ant

We’ll explore the characteristics of some of these common UK ants later in the article. 

Ants are prevalent in hot climates, ranging from 2mm to 25mm, depending on their habitat. With large heads and slender oval abdomens attached to their thorax (the equivalent of our ribcage), the sections of their bodies are connected by a tiny waist section. 

These tiny insects are surprisingly strong and extremely hard working and can benefit your garden’s ecosystem and biodiversity. They control pests naturally, aerate the soil, and help improve pollination rates (more about that later). 

Where do ants come from? 

Well, this is a bit of a chicken and egg question, really. Ants have roamed the earth far longer than humans, first appearing (it’s believed) in the mid-Cretaceous period, around 110-130 million years ago. In contrast, humans evolved from our australopithecine ancestors a mere 2 million years ago (home sapiens just 200,000 years ago!).

So, perhaps the ants might be wondering where we came from, with our strange land-locked obsessions and mobile phones! Indeed, ants are to be found almost everywhere on dry land on Planet Earth (with the exception of Antarctica, the Arctic, and a few random islands). 

So, living underground is a swarm of ants across the entire planet.

Identify ants in the garden

2 ants on a leaf
Worker ants – Photo by MD_JERRY on Unsplash

UK-based ants are usually tiny – a couple of millimetres at the most – while the largest known species (now extinct) was 6.1cm in length with a 15cm wingspan – aptly named T. giganteum.

Ants live and work in colonies – they form giant, coordinated “superorganisms”. They communicate via pheromones, sending out signals that alert each other to danger or the location of food. They work as part of a collective whole –  with a bias on the colony’s wellbeing over their own. 

I mentioned that ants are hard workers. In fact, they can carry over three times their own body weight and hold 100-times their body weight when dangling.

Queen ants can live for decades, while the average worker ant lives a much shorter existence, from a few weeks to several years. The oldest known queen ant lived for 30 years!

So, pub quiz facts aside, let’s explore the ant species we commonly find in the UK. 

Types of ants in the average UK garden

Black ants in the garden

Ants working as a team
Black ants – Photo by Salmen Bejaoui on Unsplash

Black ants (Lasius niger) are the most common species in the British Isles. You’ll recognise their shiny black bodies, around 3-5mm long. They live in colonies of around 7000 other members underneath paved surfaces, but their nests can be huge – housing up to 40,000 black ants.

If you see small holes in the joints between paving slabs, it’s likely to be the entrance to an ant nest – so if ants are causing a problem, you’ll need to find the location of their colony. 

However, black ants don’t pose any health risks to humans; they don’t bite, sting, spray formic acid, or damage property. Their jaws are too weak to break through human skin, so there’s no reason to panic if you spot a nest. 

Black ants feed on sugary substances, such as rotting fruit and nectar. But the most significant problem ants cause in the garden is their dutiful farming of aphid varieties – aphids produce honeydew, which black ants love. 

So, while black ants aren’t generally harmful and will feed on many lawn predators, such as leatherjacket grubs, they can cause an aphid problem. They breed aphids near their nest, and the honeydew can damage your grass while attracting lawn diseases

If black ants are causing problems for your lawn, it’s best to try to relocate the colony. Sprinkle peppermint or cinnamon near the entrance to the nest, and the ants are likely to move on somewhere else. 

Yellow ants in the garden

Yellow ants
Yellow ants – Photo by Hamik on Shutterstock

The Lasius flavus is a slightly smaller (2-4mm) golden-coloured ant, which is less common in the UK. 

Yellow ants build their nests underneath your grass plants. This is good for your lawn because they aerate the soil around the roots. 

Again, they feed on the honeydew of the root aphid, but these are generally harmless to your lawn. However, if a yellow ant nest grows too large, you might notice bald spots around the lawn surface. 

So, yellow ants are a little blessing – especially in heavy clay soil. They’re completely harmless, just like the black ant.  

Red ants in the garden

Extreme close up of a red ant
Red ants – Photo by Andrey Pavlov on Shutterstock

Red wood ants (Formica rufa) are considered an endangered species in the UK. They’re bright red in the middle with a red head. 

Red wood ants are master architects, building nests that emerge from deep underground, reaching up to 2m in height above the soil surface. And while black and yellow ants are harmless, a red ant will deliver a painful sting, which has helped earn their nickname: fire ants. 

So, be careful when approaching these fiery little insects. 

You’ll find red ants underneath stones and logs in your garden. And while they’re active throughout the year, you probably won’t notice them until they sprout wings during hot summers and fly off in search of new colonies. 

When are ants most active?

Ants thrive in warm weather – the higher the temperature, the more active ants become. During the winter, most colonies rest, feeding on foraged reserves until the spring. 

Most ants emerge from their winter slumber in the spring and are most active during the summer, where you’ll see them working from sunrise to sunset. 

The Pros and Cons of ants in your garden

Ants in the garden are a double-edged sword because while they support biodiversity, they can also cause damage to your lawn and your plants.  

The Pros of ants in the garden

Ants help control garden pests by feeding on their eggs and young. In fact, ants can be such an effective biological pest deterrent that some farmers introduce them to help eradicate crop-destroying insects and bugs

Additionally, ants help improve pollination, which is super-important now that many of our native pollinators are finding themselves endangered in the UK. Ants march from flower to flower, feeding on their nectar and pollinating the flower as they go. 

Ants feeding on waste food
Ants feeding – Photo by Marco Neri on Unsplash

Finally, ants support your garden’s ecosystem as they dig their underground tunnels, which helps water, oxygen, and nutrients reach your plants’ roots, including your lawn. And they help fertilise your soil as they speed up decomposition of organic materials, such as dead insects and fallen leaves. And while ants help keep your soil healthy by feeding on waste materials and harmful bugs, they make an excellent lunch for larger organisms like frogs and birds. Working together, this food cycle helps prevent lawn pests. 

Cons of ants in the garden

While a few ants in your backyard are unlikely to cause a problem, a large colony can create issues for your lawn, your veg plot, or your flower beds. 

The main problem is the pests that ants feed upon. Aphids, in particular, naturally produce a sugary nectar-like honeydew – and just like we farm cows to feed ourselves, ants farm aphids. And anyone who has tried to grow fruiting veg will know: aphids can plough through a healthy plant in no time. 

And, in large numbers, aphids can damage your lawn.

Red ants, as explained, can sting you, causing a painful skin welt that can last for several days. 

Other than that, UK ants are unlikely to cause property damage, so – if you can – leave them be. We all belong on the earth and need to live together.

How to get rid of ants in the garden naturally

If the ant population in your garden is causing problems, you’ll want to get rid of them. But there are humane ways to move your ant guests. And, in this case, focusing on individual ants is pretty pointless – you’ll need to work on the colony. 

Fight ants with an inverted flower pot

Fill a flower pot with soil and place it upside-down over the opening of your ant nest. After a couple of weeks, you’ll find that the ants have populated the flower pot. 

Remove the pot at this stage, and empty it into your compost or sprinkle it into your chicken coup – your chucks will enjoy a tasty meal of live ants. 

Remove the queen

You can find the queen by digging into the nest and finding the largest ant – that’s the queen. Obviously, she won’t be draped in ermine, and she won’t be wearing a crown. 

When you’ve found the queen, carefully remove her from the nest and place her somewhere in your garden where the colony won’t cause a nuisance. The workers will follow, and they’ll create a new nest wherever the queen lays her hat.

Fight ants with nematodes

Close up of nematodes
Nematodes – Photo by D. Kucharski K. Kucharska on Shutterstock

Parasitic nematodes are super-useful biological deterrents, helpful in killing off chafer grubs and leatherjackets and getting rid of ants. 

Nematodes are widely available online and in garden centres and will invade the ant colony and feed on ant larvae, thereby ensuring the demise of the future generation. They also chase adult ants out of the nest. They tend to die off once the food source has disappeared. 

Fight ants with vinegar

Ants really don’t like vinegar (I’m not sure what they put on their chips?!).

Mix two parts water with one part vinegar, and pour it into the ant nest. Be super careful because plants aren’t fans of acidic vinegar either and will die if they come into contact with it. 

Fight ants with garlic

Just like vampires (and your grandad), ants hate the smell of garlic.

Sprinkle garlic powder over the nest, and pour some water over it. The smell will distract the ants, and they’ll forget their way to their food source. As a result, the ants in the nest won’t feed and will die. 

Fight ants with an ant bait box

The location of the ants’ nest isn’t always obvious. So, if you’re struggling to find the colony, place a bait box on a paved surface close to the ants’ typical walking route. They’ll walk through the powder in the box and leave a powder trail as they journey back to the nest. 

And hey presto, you’ll know the nest’s location.

A bait box works for around a month, but don’t leave it out in the rain – the chemical can wash into your garden and cause damage. 

How to prevent ants in the lawn?

A single ant carrying a leaf
A single ant – Photo by Vlad Tchompalov on Unsplash

Prevention is always better than cure. So, to avoid ants from invading and damaging your lawn, follow these tips:

  1. Clean up organic waste – ants are attracted to plant-, animal-, and food remains. Therefore, clean your garden regularly, removing dead and diseased plants, flowers, twigs, and leaves. And keep your food waste in enclosed containers – don’t leave crumbs if you enjoy an al fresco lunch – ants will have a field day. 
  2. Sweep your patio or terrace – ants live under paving slabs and between tiles, so pay extra attention to your patio or terrace. Sweep regularly, and clean the tiles with a patio cleaner to ensure there’s nothing that’s going to attract ant populations.  
  3. Control aphids in your garden – removing the ants’ favourite meal is a sure way to make your garden less hospitable to an ant invasion. Spray the leaves of your plants regularly with water to flush away the aphids, or use an eco-friendly lice spray to eradicate the problem.
  4. Keep your grass short – ants seek three things in your garden: water, food, and shelter. Keeping your grass short minimises the potential for shelter, making your garden less hospitable to a colony.  
  5. Plant strongly scented plants – ants dislike strong smells (see garlic, above). So, planting marigolds, jasmine, and lavender is sure to keep the ants at bay. If it hasn’t worked, sprinkle a few strong-smelling plant leaves near the nest.  

How to repair your lawn after an ant invasion

The most visible damage likely to occur from an ant invasion is bald spots, and it’s vital to tackle these to prevent weeds from growing in place of the dead grass. 

So, overseed wherever bald spots occur. As long as the soil temperature is over 10℃, your new seed will germinate within a couple of weeks, bringing new life and vitality to your lawn. Get the lowdown with our expert guide to overseeding

Feel more informed about ants in your garden? Or do you need more info?

I hope you’ve got all the info you might need to control ants in your lawn, but if you have any questions, don’t hesitate to get in touch. 

Drop us an email with your question, and we’ll get back to you as soon as we can. 

Thanks for reading. 

FAQ

Q: Why do I have lots of ants in my garden?

A: Ants are attracted to sugar sources. So, if there are lots of ants in your garden ensure that you: dispose of your food waste in enclosed bins; clear food scraps after eating outside; remove organic matter, such as fallen leaves and dead insects from your lawn. 

Q: Should I kill the ants in my garden?

A: Most ants found in the UK are entirely harmless, and can actually improve the biodiversity of your garden. Red ants can sting, however, so be careful when coming into contact with them. Black and yellow ants won’t bite or sting you. 

Q: Do ants cause problems in the garden?

A: Ants can cause bald spots on your lawn and can encourage aphids that will eat your garden vegetation. However, far from being a pest, ants actually help aerate your soil, getting water, oxygen, and nutrients to your plants’ roots, as well as serving as tasty meals for frogs and birds. So, don’t kill them if you can avoid it. 

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