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Companion Planting in July: Best Combinations for Success
? Introduction: Boost Your Garden Naturally This Summer
As your garden hits full swing in July, there’s still time to use companion planting to enhance growth, deter pests, and maximise yields — all without chemicals. Companion planting is the practice of growing different plants together based on their ability to benefit one another. It’s an age-old gardening method that combines natural pest control, pollinator attraction, soil improvement, and space efficiency.
Whether you’re growing vegetables, herbs, or flowers, July is a great month to use companion planting strategies to boost performance, especially as certain pests become more active and crops compete for nutrients.
In this guide, you’ll discover the best companion plant combinations to use in July, how to plant them, and the benefits they bring to your allotment or garden.
? What Is Companion Planting?
Companion planting involves pairing certain crops together for mutual benefit. Some plants:
- Repel pests (e.g. basil deters aphids and whiteflies)
- Attract pollinators or beneficial insects
- Improve flavour or growth (e.g. basil and tomatoes)
- Shade or support other crops
- Break up soil or fix nutrients
In July, you can use companion planting to:
- Fill gaps after early harvests
- Protect crops from peak-season pests
- Attract bees for better fruit set
- Maximise late-season sowing space
? Best Companion Plant Combinations to Try in July
? 1. Tomatoes + Basil + Marigolds
A classic trio! Perfect for July when tomatoes are in full flower or fruiting.
Benefits:
- Basil repels whiteflies, aphids, and hornworms
- Marigolds deter nematodes and attract pollinators
- Basil may even improve tomato flavour
How to plant:
- One basil plant every 2–3 tomato plants
- Interplant marigolds around the bed edges
? 2. Lettuce + Radishes + Chives
Great for shady or container-friendly companion planting in hot weather.
Benefits:
- Radishes grow quickly and break soil for lettuce
- Chives deter aphids and slugs
- Lettuce provides ground cover and retains moisture
How to plant:
- Sow radishes and lettuce in alternating rows
- Add clumps of chives at corners or between rows
? 3. Runner Beans + Sweetcorn + Squash (The Three Sisters)
An ancient Native American companion method — excellent for allotments.
Benefits:
- Beans fix nitrogen in the soil
- Corn provides support for climbing beans
- Squash shades the ground and prevents weeds
How to plant:
- Plant in mounds or blocks, not rows
- Sow corn first, then beans 2 weeks later, then squash around the edges
? 4. Cabbage Family (Brassicas) + Nasturtiums + Mint
Protects your July brassicas from cabbage white butterflies and aphids.
Benefits:
- Nasturtiums act as a trap crop (they attract pests away)
- Mint repels flea beetles and ants
- Mint also attracts predatory wasps
How to plant:
- Grow nasturtiums at the edge of brassica beds
- Keep mint in pots to prevent spreading and place nearby
? 5. Potatoes + Horseradish + Calendula
A defensive planting combination ideal for preventing late blight and other July issues.
Benefits:
- Horseradish is believed to boost potato disease resistance
- Calendula attracts ladybirds and pollinators
- Horseradish also repels some beetles and borers
How to plant:
- Plant horseradish at corners of your potato bed
- Interplant calendula throughout the bed
? 6. Courgettes + Nasturtiums + Borage
These quick-growing plants are highly productive in July and work well together.
Benefits:
- Nasturtiums deter aphids and blackfly
- Borage attracts bees and improves pollination
- Borage also improves courgette flavour and reduces blossom end rot
How to plant:
- Plant borage at the ends of rows
- Scatter nasturtium seeds throughout courgette beds
? 7. Sweetcorn + Dill + Sunflowers
Tall plants offer shade and structure; herbs bring in beneficial insects.
Benefits:
- Dill attracts lacewings and parasitic wasps
- Sunflowers provide natural trellising and attract pollinators
- Great for vertical companion planting
How to plant:
- Plant dill between corn plants
- Add sunflowers at the back of the bed or border
? 8. Carrots + Onions + Parsley
A highly aromatic trio for pest prevention and flavour.
Benefits:
- Onions repel carrot root fly
- Carrots deter onion fly
- Parsley attracts hoverflies and wasps
How to plant:
- Alternate rows of onions and carrots
- Place parsley between or around rows
? 9. Spinach + Strawberries + Thyme
A productive and pollinator-friendly ground layer combo.
Benefits:
- Strawberries benefit from thyme’s pest-repelling oils
- Spinach shades soil and suppresses weeds
- Thyme attracts bees and deters cabbage worms
How to plant:
- Use strawberries as groundcover
- Dot thyme plants throughout
- Sow spinach in pockets between
? 10. Pak Choi + Coriander + Marigold
Great for containers or raised beds and useful for late July sowings.
Benefits:
- Coriander deters aphids and spider mites
- Marigolds help reduce nematodes and attract ladybirds
- Coriander bolts slowly in partial shade under pak choi
How to plant:
- Sow pak choi and coriander in small clusters
- Add marigolds to pot edges or raised bed corners
? Pest-Repelling Companions to Plant in July
| Pest Problem | Best Companion Plants |
|---|---|
| Aphids | Chives, basil, nasturtiums, marigolds |
| Cabbage whitefly | Mint, sage, thyme, nasturtiums |
| Carrot root fly | Onions, leeks, rosemary |
| Slugs and snails | Lavender, fennel, rosemary |
| Whitefly (tomatoes) | Basil, tagetes (French marigolds) |
| General pests | Garlic, onions, strong-smelling herbs |
? Attracting Beneficial Insects in July
July is the perfect time to encourage pollinators and predatory insects to naturally manage pests and boost productivity.
Plants that attract helpful bugs:
- Borage – bees, hoverflies
- Marigolds – ladybirds
- Dill and fennel – lacewings and wasps
- Calendula – pollinators, hoverflies
- Lavender – bees, butterflies
Grow these near flowering veg like courgettes, tomatoes, beans, and squash to increase pollination and fruit set.
? July Companion Planting Tips
- Water in the mornings to reduce mildew risk between dense plantings
- Mulch well to reduce water competition in mixed beds
- Harvest regularly to maintain airflow
- Don’t overcrowd – companion planting works best with proper spacing
- Avoid pairing incompatible plants (e.g. onions near beans)
? Top 10 Questions About Companion Planting in July
1. Can I still start companion planting in July?
Yes — it’s a great time to add quick-growing herbs or flowers that benefit your summer crops.
2. What’s the best companion for tomatoes in July?
Basil and marigolds. They improve flavour, pollination, and repel pests.
3. Will nasturtiums take over my bed?
They can sprawl — prune regularly and grow trailing varieties on edges or containers.
4. Can I grow mint next to other veg?
Yes — but keep it in pots to stop it spreading aggressively.
5. Do companion plants affect flavour?
Some may enhance it slightly (e.g. basil improves tomato flavour), though results vary.
6. Can I plant herbs with my vegetables?
Absolutely. Herbs like coriander, dill, parsley, and chives are excellent companions.
7. What flowers are best for attracting pollinators now?
Try borage, calendula, lavender, and cosmos — all bloom through summer.
8. Will marigolds really stop pests?
They help — especially French marigolds, which deter nematodes, aphids, and whiteflies.
9. Should I companion plant in pots too?
Yes! Use shallow-rooted companions like herbs and flowers in larger containers.
10. Are there plants that don’t go well together?
Yes. Avoid planting onions near beans, fennel near almost anything, and keep potatoes away from tomatoes (blight risk).
? Conclusion: Make the Most of July with Smart Pairings
Companion planting is a powerful — and natural — way to boost plant health, deter pests, and attract beneficial insects in the heat of summer. July may be mid-season, but it’s not too late to introduce strategic pairings that can make all the difference to your garden or allotment.
Whether you’re growing tomatoes, beans, cabbages, or salad crops, there’s a companion that can help them grow better — naturally.
So plant a few herbs, sow some marigolds, mix in nasturtiums, and watch your summer garden thrive the organic way.