3 Pests That Can Actually Make Your Garden Healthier

, written by Benedict Vanheems gb flag

Wasp pollinating a raspberry flower

Our approach to the way we garden has come a long way in recent years. Today more of us garden organically, working with the rhythms of Mother Nature rather than resisting her. We’ve realized that our gardens are a series of carefully balanced ecosystems. Break the food chain by spraying insecticides willy-nilly or being over fastidious and you’ll upset the balance, making your plants more susceptible to future pest attacks.

Nothing is ever black and white – and there are more than 50 shades of grey! Life’s a complicated web, and not all ‘pests’ should be vilified. In the right place, even aphids can be of enormous benefit to your garden’s ecosystem. Beneficial bugs such as hoverflies and lacewings will feed on them, and these in turn will help to sustain insect-eating birds.

Ladybug larvae will eat prodigious numbers of aphids

The Garden Ecosystem

Garden biodiversity is important, because a garden with lots of different living things in it is healthier. If your garden has a wide range of habitats including trees, shrubs, flowers, longer grass, a thriving compost heap and perhaps a pond, then it stands to reason you’ll have a lot of wildlife too.

Pests are an important part of this ecosystem, so annihilating every last aphid with a spray, for instance, would knock out a vital part of the food chain. As a result there’d be fewer hoverflies, so when the aphids returned their natural predators wouldn’t be around in anywhere near the numbers they were before. The unintended outcome of all this? Aphids left to run amok!

One spring this concept was beautifully illustrated in my own garden when black bean aphids made themselves at home on my fava beans. I played a waiting game. Sure enough, a few days later, ladybug larvae made an appearance. They’d recently hatched out on the nettles running along the side of the plot and, with the arrival of their favorite snack, it wasn’t long before they were positively gorging on the aphids to bring them back into step.

Pests With Benefits

Some creatures are both the gardener’s friend and foe, depending on the time of year and what they’re up to. This is where things can get complicated. Let’s take a few common examples of traditional pests that can be a huge boon to the gardener in the right setting.

Slugs are beneficial to a healthy composting system

1. Slugs in the Compost

We’re often told to completely eradicate slugs – to seek the slimy gangsters out by night, to crush their pearly eggs and to set beer traps to lure them to a watery grave. But did you realise that slugs in your compost heap are no bad thing?

Slugs and snails help to break down decaying organic matter and will work hard to draw fresh material from the top of the compost heap down into its depths. With enough food to hand there will be little reason for the slugs to spread out into the garden. Their eggs are likely to provide a tasty snack for something higher up the food chain, so they’re helping to fuel that all-important garden ecosystem too. Slugs in your compost heap? Leave them well alone!

2. Wasp Patrol

Wasps and hornets are a nuisance. They sting when provoked and never get the message at the summer picnic: just buzz off! For this reason they’re often seen as the enemy. But this is character assassination of the worst order. Wasps are carnivores and their preferred protein snack comes in the form of a myriad of smaller insects. And, while admittedly not as effective as bees, they’re important pollinators. This makes them the organic gardener’s friend.

Even wasps have their uses in the garden!

A pragmatic approach works best with wasps. If they’re not harming you and their nest is out of the way, peaceful coexistence is worth pursuing. You may even come to welcome the sight of your wasps – and the dent they will be making to the local pest population.

3. Earwigs Eat Aphids

The earwig is another often-misunderstood insect. Earwigs live in moist, dark places, such as on the fringes of the compost heap or amid mulch. But very wet weather sends them scampering up into plants for shelter where they will then feed, turning seedlings, leafy greens and herbs ragged as they rasp.

Earwigs are effective pest predators

However, like wasps earwigs are highly effective predators of many tiny insects, including aphids and other common pests. In most cases earwigs harmlessly go about keeping our enemies in check, so if they aren’t doing any harm, leave them be. Earwigs love to hunt in ivy, thickets of weeds and piles of leaves and debris, so grow susceptible plants away from their favorite haunts.

The message to all of this is that garden pests contribute in their own way to the health of your garden’s ecosystem, and some even benefit us gardeners. Remember, we are merely caretakers of this world, and that includes our gardens. Let’s learn to live with these ‘pests with benefits’.

Bugs, Beneficial Insects and Plant Diseases

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Show Comments


"We really appreciate article about "good" bugs as well as all you have done educating us about what to do to prevent, protect from and manage "bad" bugs. Thanks!"
Nebraska farm girl on Saturday 21 October 2017
"We really appreciate article about "good" bugs as well as all you have done educating us about what to do to prevent, protect from and manage "bad" bugs. Thanks!"
Nebraska farm girl on Saturday 21 October 2017
"Predators such as wasps, plus parasitoid wasps and tachinid flies, etc., do a mighty job in keeping caterpillars at bay in our fields and gardens. Unfortunately, these creatures are anathema to those (like me!) who plant and maintain butterfly gardens. One person's medicine, another's poison."
Crunch Hardtack on Sunday 22 October 2017
"All bugs have their place in the intricate web of life. It's recognising that while some bugs are a nuisance to the gardener, they do have their place elsewhere. We should all be treading lightly - taking care of pests as organically as we can so as not to upset nature's delicate balance. Thanks for reading!"
Ben Vanheems on Monday 23 October 2017
"I will right away clutch your rss as I can't to find your e-mail subscription hyperlink or e-newsletter service. Do you have any? Please let me know so that I could subscribe. Thanks. winterer.ru"
Withers on Tuesday 9 June 2020
"If you go right to the top of the page and click on 'Create an account' you will be enter in your email details to receive our newsletters. Hope this helps."
Ben Vanheems on Tuesday 9 June 2020
"Not sure if the wasps you write about are the ones in my garden these have a long elongated nest and there are a lot off them that seem to stay on the nest most off the day. I cannot even trim the hedge they are in without getting attacked. I have tried to leave them be but they do not like being disturbed."
Fay on Sunday 21 March 2021
"Hi Fay. They do sound rather aggressive, so not sure if they are the standard wasps we're familiar with here in the UK. The ones we have only rarely sting, though I have also been stung towards the end of the season while trimming a hedge, so I guess they can be provoked!"
Ben Vanheems on Monday 22 March 2021

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