By Harris Seeds Guest Growing Partner, Tom Stokes Harlow
If you’re reading this, chances are – you're not new to gardening. You’ve already put in the sweat equity of starting seeds, tending beds, and harvesting crops, only to discover one of the universal truths of growing: pests like to show up to your garden party, and they don’t exactly RSVP.
I remember my early years—freshly tilled soil, healthy seedlings, and then one morning, a whole row of cabbage skeletonized by caterpillars. My heart sank. I thought the only answer was a spray bottle full of something harsh – but then I worried about the effect those chemicals would have on the health of my vegetables (and me). Over the years, I learned there’s a better, gentler, and far more sustainable way: letting nature handle nature.
So, I want to share with you what I’ve learned about organic garden pest control through the help of some incredible little allies—ladybugs, lacewings, and parasitic wasps. Yes, I’m talking about treating bugs with more bugs – but fear not – I'll walk you through it. Whether you’re a home grower looking to throw away your chemicals (safely, according to the directions, of course) or a professional grower looking to market yourself as a more sustainable farmer (or simply improve crop yields without chemicals) then this is one of the smartest moves you can make.
Why Rely on Beneficial Insects?
Start with this reframing: think of your farm or garden as an ecosystem, not just a production space. Every insect, bird, and microbe has a role to play. The “bad guys” (aphids, mites, caterpillars, thrips, whiteflies) are balanced out by the “good guys” (ladybugs, lacewings, parasitic wasps, ground beetles, predatory mites).
The problem? Modern practices like tilling, monocropping, and the use of chemical sprays often tips the balance in favor of pests (bad guys). Reintroducing balance means welcoming predators back into the picture.
Here’s why it’s worth your attention:
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Lower input costs. Less money spent on chemical sprays means more margin in your pocket. For home growers and professional growers alike, this also means less time and energy spent applying these chemicals.
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Stronger marketing appeal. Consumers are hungry for food grown with fewer chemicals (please forgive the bad pun). Phrases like “grown with natural pest control” or “chemical free,” or “grown to protect pollinators” make customers perk up.
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Resilient crops. Plants supported by healthy ecosystems recover faster from stress. No more worrying about damaging your plants due to accidental over application of chemicals.
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Year-over-year benefits. Once you’ve built up populations of beneficial insects, they’ll return, breed, and stay. Consider them your friendly new neighbors.
Simply put: if you can recruit nature’s helpers, you’re not just growing crops—you’re growing a system that can sustain itself.
Meet Your Insect Allies
Ladybugs (Ladybird Beetles)
Ladybugs are considered good luck for good reason! Every grower wants to know how to attract ladybugs to vegetable gardens. Ladybugs are the poster children of beneficial insects. Not only are they cute, but a single adult ladybug can eat 50 aphids in a day, and their larvae—those little black-and-orange alligator-looking critters—are even hungrier. (Kids always are!)
They don’t stop at aphids either. Ladybugs will also munch on scale, mites, and mealybugs. If you’re plagued by sap-sucking insects, ladybugs are your first line of defense.
How to encourage them:
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Provide shallow water sources (a dish with pebbles works).
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Avoid broad-spectrum sprays—one pass can wipe out your ladybugs along with the pests.
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You can source them. Yes, you can buy ladybugs off the internet, and they can be shipped to you in the mail. A female ladybug can lay up to 50 eggs daily, so even purchasing a small amount to release into your growing space and rapidly turn into a healthy population.
Lacewings
Their name sounds delicate, but lacewings are predators to be reckoned with. The adults feed on pollen and nectar, but their larvae—sometimes called “aphid lions”—are voracious. They’ll take down aphids, thrips, whiteflies, and caterpillar eggs.
As adults, Lacewings mostly sip on nectar, pollen, and honeydew. It’s their larvae that really do the heavy lifting—they’ll go after soft-bodied pests like aphids, thrips, whiteflies, leafhoppers, spider mites (red mites especially), and mealybugs.
Once they hatch, lacewing larvae travel over the foliage searching for food. They’ll feed for a solid 2–3 weeks before spinning a cocoon and later emerging as adults. The nice thing about lacewings is that they keep working for you across the season. They can handle a wide range of temperatures – including frosts - and usually play well alongside other beneficial insects.
If you want to keep lacewings around long term, think about pairing releases with companion planting or cover crops. That extra habitat and food helps the adults stick around, lay more eggs, and set you up with another generation of natural pest control.
How to encourage them:
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Plant flowers like cosmos, coreopsis, fennel, and sunflowers.
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Leave some weedy or grassy edges as habitat.
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Release them if necessary—like ladybugs, you can source them via natural pest control companies and have them shipped to you.
Parasitic Wasps
I’ll admit, they don’t have the same cute appeal as ladybugs, but parasitic wasps are a grower’s secret weapon. These wasps lay their eggs inside pests like moth caterpillars or aphids. The larvae then develop inside, controlling the pest population from within (grizzly, I know). It sounds like something from a sci-fi movie, but it’s highly effective—and completely safe for humans.
How to encourage them:
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Plant umbrella-shaped flowers like dill, fennel, mountain mint, lace flower, and parsley.
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Maintain a continuous supply of blooms through the season.
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Reduce tillage to preserve overwintering sites.
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You can also purchase dispensers of parasitic wasps. Using a controlled release method, wasps will emerge over 2 weeks from the dispensers or capsules and search for eggs to parasitize within the crop. Multiple applications might be needed – releasing wasps is a bit more nuanced than releasing ladybugs and lacewings.
Creating Insect Habitats in Organic Gardens
If you want these beneficial insects to stick around, you’ll need to give them food, shelter, and water—the same way you’d take care of livestock, just on a smaller scale. This is where creating insect habitats in organic gardens comes in.
Think of it like building a little village for your bug allies:
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Continuous blooms. Aim to have something flowering at all times of the growing season. Early spring blossoms feed insects when they’re just emerging; late-season blooms keep them around when pests surge in late summer.
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Shelter. Leave some mulch, leaf litter, or hedgerows for overwintering. Even small patches of habitat can host entire insect colonies.
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Water sources. Provide shallow dishes with stones or floating corks so insects can safely land and drink.
By setting aside just a fraction of your space, you’ll attract, support, and maintain thriving populations of beneficial insects year after year.
A Note on Introducing Beneficial Insects You Purchase through a Supplier
The best time to bring in beneficial insects is before pests get out of hand. If you wait until you already have a heavy infestation, predators won’t be able to keep up. Think of it as prevention, not rescue—it works best when you plan ahead and stay consistent.
Start by watching your crop closely. Sticky traps are an easy way to see what pests are present, how many there are, and when they’re most active. Different colored sticky traps attract different bad guy bugs, and you can learn more about that in our short video here.
Once you know what you’re dealing with, you can choose the right beneficial insects for the job. Some eat a wide range of pests, while others focus on one or two specific insects. Matching the right predator (good guy) to your pest (bad guy) and growing conditions will give you the best results and make biological control feel much more manageable.
Summary: Steps to Attract and Keep Beneficial Insects
If you’re looking to expand your offerings and market yourself as a grower who leans on natural systems, here’s a practical roadmap you can follow:
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Identify your key pests. Are aphids, caterpillars, or whiteflies your main issue? Start by focusing on the insects that target those pests.
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Choose the right allies. For aphids, think ladybugs and lacewings. For caterpillars, parasitic wasps. For mites, predatory mites or ladybugs.
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Minimize chemical sprays. If you must spray, choose selective organic options (like neem or insecticidal soap) and apply in the evening when beneficials are less active.
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Add habitat structures. Install insect hotels, leave brushy areas, or simply reduce mowing along borders.
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Observe and adapt. Walk your growing areas often. Learn to recognize beneficial insects in both adult and larval stages. Adjust your practices based on what you see.
Marketing the Benefits
From a business perspective, this isn’t just about healthier crops—it’s also about differentiation. Customers love knowing their food is grown with care for both better health and the environment. Being able to say you practice “natural pest control with the help of beneficial insects” adds value to your produce.
Consider adding small signs at markets:
- “This lettuce was protected by ladybugs instead of chemicals.”
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“Our tomatoes are grown with natural pest control.”
It may seem like a small detail, but it builds trust and sets you apart from growers who lean heavily on sprays.
Final Thoughts
Adding new products and practices to your growing operation can feel daunting, but trust me—inviting beneficial insects into your system is one of the most rewarding changes you’ll ever make. You’ll save money, improve yields, and align your farm with the values today’s customers care about most.
Remember this: you don’t have to fight every pest battle alone. Nature has been running pest management systems for millennia. All you need to do is step aside, create the conditions, and let your six-legged farmhands get to work.
So this season, as you plan your fields or greenhouse, think not just about crops, but about companions. Plant those insectary flowers, set out shallow water dishes, and reduce your sprays. Before long, you’ll look down your rows and see ladybugs marching, lacewing larvae patrolling, and tiny wasps buzzing—all working for you, free of charge.
So here’s to strong plants, balanced ecosystems, and a new generation of growers who know that sometimes, the best way to manage pests is to put the sprayer away and let nature take the lead.
