Spring is planting season in Sydney, and it's the perfect time to design a garden that keeps pests down without reaching for chemicals. Companion planting—placing certain plants together so they help each other—is one of the oldest tricks in the book, and paired with hardy Sydney natives it can quietly lower the pest pressure around your home.
It won't stop termites or clear an infestation. But as a first layer of defence in the garden, it genuinely helps. Here's how to use it.
Set expectations first: Companion planting reduces pest pressure and supports beneficial insects—it doesn't replace pest control. Think of it as lowering the background level so problems start smaller and less often.
How Companion Planting Works
The effect comes from a few simple mechanisms:
- Repelling: Strong-scented plants mask the smell of a target crop or deter specific insects.
- Attracting beneficials: Flowering plants draw ladybirds, lacewings, hoverflies, and predatory wasps that eat pest insects.
- Trap cropping: A sacrificial plant lures pests away from what you want to protect.
- Habitat: A diverse planting supports birds and insects that keep pest numbers in balance.
👉 Related: Natural Ant Deterrents and Landscaping That Attracts or Repels Pests.
Classic Companion Pairings for Sydney Gardens
| Plant | Helps Deter | Plant Near |
|---|---|---|
| Marigolds | Aphids, nematodes, some beetles | Tomatoes, veg beds, borders |
| Basil | Flies, mosquitoes, aphids | Tomatoes, outdoor dining areas |
| Lavender | Moths, fleas, flies, mosquitoes | Paths, patios, entryways |
| Rosemary & sage | Cabbage moth, carrot fly, mosquitoes | Veg beds, borders |
| Nasturtium | Aphids (as a trap crop) | Away from prized plants |
| Garlic & chives | Aphids, some beetles | Roses, veg beds |
| Mint (contained) | Ants, aphids, cabbage moth | Pots near doors (it spreads) |
Sydney Native Plants That Support a Low-Pest Garden
Natives are the smart backbone of a Sydney garden—drought-tolerant, low-maintenance, and excellent at drawing the birds and beneficial insects that keep pests in check. They earn their place by building a resilient ecosystem, not by repelling pests directly.
- Grevillea—nectar-rich, attracts insect-eating birds and beneficial insects.
- Bottlebrush (Callistemon)—brings birds that prey on garden pests.
- Westringia (native rosemary)—hardy hedging that supports beneficials.
- Lomandra—tough ground cover that shelters predatory insects.
- Native daisies & everlastings—flowers that feed hoverflies and ladybirds.
- Dianella—hardy, bird-attracting, low fuss.
Keep them away from the wall line: As with any planting, don't let natives grow into contact with the house. Dense shrubs against walls become highways for ants and spiders. Maintain a clear zone. 👉 Landscaping That Attracts or Repels Pests
Design Principles for a Pest-Resistant Garden
- Diversity beats monoculture—a mix of plants avoids the pest explosions a single crop invites.
- Flower year-round—keep something flowering to feed beneficial insects across seasons.
- Group by need—cluster plants with similar water needs so you don't overwater and create damp pest habitat.
- Put aromatics near people—line paths, patios, and doors with lavender, rosemary, and basil.
- Use trap crops at the edges—draw aphids to nasturtiums away from your veg.
- Keep a clear zone at the house—no planting touching walls or the roofline.
Be Realistic About What It Can't Do
Companion planting is a genuine help, but honesty matters:
- It won't stop termites—only inspections and barriers do that.
- It won't clear an established infestation of ants, cockroaches, or rodents.
- Its effects are gradual and partial, not instant or complete.
Use it as one layer alongside good hygiene, sealing, and professional treatment where needed. 👉 Related: Seasonal Pest-Proofing Maintenance.
Where a Professional Fits
A well-planned garden lowers pressure; it doesn't replace protection. Pair it with an annual termite inspection—especially important if you're adding garden beds, mulch, or retaining walls this spring—and a perimeter treatment where pests are already active.
👉 See the Sydney Pest Calendar for what's active now, or read When to Call Professional Pest Control.
Final Thoughts
A thoughtfully planted Sydney garden—aromatic companions near living areas, hardy natives drawing birds and beneficials, and a clear zone at the house—quietly keeps pest pressure low without chemicals.
It's a first layer, not the whole defence. Combine it with sealing, hygiene, and an annual termite inspection, and your garden works with you rather than inviting pests in.
👉 Get garden-to-home pest advice: Pest Control Sydney Wide