Arugula companion plants can make the difference between a thriving salad bed and a frustrating battle with pests. Arugula thrives alongside herbs like dill and chamomile, which attract beneficial insects that keep pests away. If you are tired of hole-ridden leaves and bolting plants, the solution is simpler than you think: choose the right neighbors for your arugula.
In this guide, you will learn exactly what to plant next to arugula, what to avoid, and how to structure your garden for maximum yield. No fluff, just practical steps.
Why Arugula Needs Companions
Arugula is a fast-growing, cool-season leafy green. It belongs to the Brassicaceae family, which means it shares enemies with cabbage, kale, and broccoli. Flea beetles, aphids, and cabbage loopers love it.
Companion planting is not about magic. It is about using plants that repel pests, attract predators, or improve soil conditions. When you pair arugula with the right partners, you reduce chemical inputs and increase your harvest.
Understanding Pest Pressure
Flea beetles are the number one enemy of arugula. They leave tiny shot holes in the leaves. Arugula companion plants like catnip and mint can mask the scent of the crop, confusing these beetles.
Aphids also cluster on new growth. They suck sap and spread disease. Ladybugs and lacewings eat aphids, and you can attract them with dill, fennel, and yarrow.
Arugula Companion Plants: The Best Neighbors
Here is the core list of proven arugula companion plants. Each one serves a specific purpose, from pest control to shade provision.
Herbs That Protect Arugula
Herbs are the backbone of any companion planting strategy for arugula. Their strong scents confuse pests and their flowers feed beneficial insects.
- Dill: Attracts hoverflies and parasitic wasps that eat aphids and caterpillars. Dill grows tall, so plant it on the north side of your arugula bed to avoid shading.
- Chamomile: Increases essential oil production in nearby plants, making arugula less tasty to pests. It also adds calcium to the soil.
- Catnip: Repels flea beetles effectively. Studies show catnip deters several beetle species. Keep it in a pot to prevent spreading.
- Rosemary: Its woody scent confuses cabbage moths and other leaf-eating insects. Rosemary likes dry soil, so plant it at the edge of the bed.
- Mint: Strongly repels ants and aphids. But mint is invasive. Always plant it in a sunken container.
Vegetables That Support Arugula
Some vegetables make excellent arugula companion plants because they provide shade or improve soil structure.
- Carrots: Their feathery foliage does not compete with arugula for space. Carrots also break up soil, allowing arugula roots to access deeper moisture.
- Onions and Garlic: The sulfur compounds repel aphids and flea beetles. Plant them in rows between arugula patches.
- Lettuce: Arugula and lettuce have similar water needs. They grow well together, and lettuce provides light shade that prevents arugula from bolting in warm weather.
- Beets: They add minerals to the soil and their broad leaves suppress weeds. Beets do not compete heavily for nitrogen.
- Spinach: Like lettuce, spinach offers shade and shares similar growing conditions.
Flowers That Bring Predators
Flowers are not just pretty. They are a key part of arugula companion plants because they feed predatory insects.
- Nasturtiums: These act as trap crops. Aphids prefer nasturtiums over arugula. Check them regularly and remove heavy infestations.
- Marigolds: Their roots release compounds that repel nematodes. The flowers attract hoverflies.
- Alyssum: Tiny flowers that attract parasitic wasps. These wasps lay eggs inside caterpillars, killing them.
- Yarrow: Attracts ladybugs and lacewings. It also accumulates nutrients that benefit neighboring plants.
What Not To Plant With Arugula
Just as some plants help, others harm. Avoid these arugula companion plants mistakes.
Brassicas Are Not Friends
Do not plant arugula next to other brassicas like cabbage, broccoli, or kale. They share the same pests and diseases. If one gets flea beetles, they all get flea beetles.
This creates a buffet for pests. You want diversity, not a monoculture of related plants.
Heavy Feeders To Avoid
Arugula is a light feeder. Avoid planting it next to heavy feeders like corn or tomatoes that will steal nitrogen and water.
Strawberries are also a poor choice. They attract slugs, which will happily eat your arugula leaves.
Fennel Is A Bad Neighbor
Fennel releases chemicals that inhibit the growth of many plants, including arugula. Keep fennel far away from your salad bed.
How To Plan Your Arugula Bed
Now that you know the best arugula companion plants, here is a step-by-step method to arrange them.
- Choose a sunny spot: Arugula needs 4-6 hours of sun. In hot climates, afternoon shade is helpful.
- Prepare the soil: Arugula likes rich, well-draining soil with a pH of 6.0-7.0. Add compost before planting.
- Plant in blocks: Instead of single rows, plant arugula in a block. This makes it easier to interplant companions.
- Interplant herbs: Place dill and chamomile at the corners. Plant catnip or mint in pots sunk into the ground.
- Add flowers: Scatter nasturtium and marigold seeds along the edges.
- Use row covers: For the first two weeks, cover the bed with floating row cover to exclude flea beetles while the plants establish.
- Water consistently: Arugula bolts quickly in dry soil. Keep the bed evenly moist.
Timing Your Planting
Arugula is a cool-season crop. Plant it in early spring or fall. Your companion plants should be chosen based on the season.
In spring, use cool-season companions like lettuce, spinach, and peas. In fall, use the same. Avoid heat-loving companions like basil unless you have a mild climate.
Using Trap Crops Effectively
Trap crops are plants that attract pests away from your main crop. Nasturtiums are the best trap crop for arugula companion plants.
Here is how to use them:
- Plant nasturtiums two weeks before arugula.
- Place them at the perimeter of the bed.
- Check them daily for aphids.
- If they are covered, cut them back or remove them entirely.
This method keeps your arugula clean without pesticides.
Beneficial Insects You Want To Attract
Your goal is to create a habitat for predators. These are the insects you want in your garden:
- Ladybugs: Eat aphids and scale insects.
- Lacewings: Their larvae are voracious aphid eaters.
- Hoverflies: Their larvae eat aphids, and adults pollinate.
- Parasitic wasps: They control caterpillars and aphids.
- Ground beetles: They eat slugs and snail eggs.
To attract them, you need flowers with small, open nectaries. Dill, fennel, alyssum, and yarrow are excellent.
Common Problems And Companion Solutions
Let us address specific issues you might face with arugula companion plants.
Flea Beetles
If you see tiny holes in the leaves, you have flea beetles. Solutions:
- Plant catnip and mint nearby.
- Use row covers early in the season.
- Water regularly; flea beetles prefer dry conditions.
- Apply diatomaceous earth around the base of plants.
Bolting (Going To Seed)
Arugula bolts when temperatures rise above 75°F (24°C). Companions can help:
- Plant lettuce or spinach on the south side to provide shade.
- Use taller plants like dill to create dappled shade.
- Mulch heavily to keep soil cool.
Slugs And Snails
These pests love moist, cool environments. Companions that help:
- Plant thyme or rosemary, which deter slugs.
- Avoid planting arugula next to strawberries.
- Use crushed eggshells or coffee grounds as a barrier.
Seasonal Companion Planting Guide
Your choices will vary by season. Here is a quick breakdown.
Spring Planting
Cool temperatures favor arugula. Companions:
- Lettuce
- Spinach
- Peas (they add nitrogen to soil)
- Radishes (they break up soil)
Fall Planting
Fall is similar to spring. Add:
- Garlic (planted in fall, harvested in summer)
- Onions
- Kale? No, avoid brassicas.
Summer (If You Must)
Arugula struggles in summer heat. If you plant it, use:
- Tall sunflowers for shade
- Okra as a living shade structure
- Mint to cool the soil
Frequently Asked Questions
Can I Plant Arugula With Tomatoes?
It is not ideal. Tomatoes are heavy feeders and need warm conditions. Arugula prefers cool weather. If you must, plant arugula in the shade of tomatoes in early spring, but expect a shorter harvest.
What Is The Best Companion Plant For Arugula To Repel Flea Beetles?
Catnip and mint are the most effective. They mask the scent of arugula and confuse flea beetles. Plant them in containers to prevent them from taking over your bed.
Can Arugula And Basil Be Planted Together?
Basil is a warm-season herb. It will not thrive in the cool conditions arugula prefers. It is better to plant basil after arugula has finished for the season.
How Close Should Companion Plants Be To Arugula?
Keep companions within 12-18 inches of arugula for pest-repelling benefits. However, do not let taller plants shade arugula completely. A little shade is good, but full shade will slow growth.
Do Marigolds Really Help Arugula?
Yes. Marigolds repel nematodes in the soil and attract hoverflies. They are one of the most reliable arugula companion plants for pest control.
Final Layout Example
Here is a simple bed layout you can copy:
- North side: Dill and chamomile
- South side: Lettuce and spinach (to shade arugula)
- Center: Arugula in a block
- Edges: Nasturtiums and marigolds
- Corners: Potted catnip and mint
This arrangement gives you pest control, shade, and a continuous harvest.
Maintenance Tips For A Companion Bed
Companion planting is not set-and-forget. You need to maintain the system.
- Remove yellowing leaves from arugula promptly.
- Harvest arugula regularly to encourage new growth.
- Prune herbs like dill to prevent them from overshadowing.
- Replant trap crops like nasturtiums if they get overwhelmed.
- Rotate your crops each year to prevent soil-borne diseases.
By following these steps, your arugula will be healthier and more productive. The right arugula companion plants reduce your workload, not increase it.
Start small. Pick two or three companions from this list and test them in your garden. Observe what works in your climate. Over time, you will develop a system that practically runs itself.
Remember, the goal is not perfection. It is a resilient, productive garden where plants support each other. With the right neighbors, your arugula will thrive with minimal fuss.
