10 Best Companion Plants for Green Beans (and What to Avoid)

I used to think green beans were the easiest crop in the world.

My first season, I planted a row of bush beans and expected them to take care of themselves. But by mid-summer, Mexican bean beetles had turned my leaves into lace, and the soil was dry and hard. The next year, I started interplanting them with other crops. It changed everything.

This is my personal list of the best companion plants that keep my green beans healthy, ward off beetles, and make the most of my bed space. All tested in my backyard. All low-maintenance.

1. Summer Savory

Sun	Full sun
Water	Medium, well-draining
Height	12-18 in (30-45 cm)
Zone	2-11 (annual)

This is the plant I’d start with if you only have room for one companion. Summer savory is a sweet, aromatic herb that has been grown alongside beans for centuries. It emits a strong, spicy scent that masks the smell of bean foliage, confusing Mexican bean beetles before they can land (seriously, it smells that good). I plant a small border of savory on the sunny side of my bean beds. It keeps the pests away, and the herb tastes wonderful cooked right alongside the fresh beans.

Tip: Trim the herb frequently. Regular harvesting keeps the plant bushy and prevents it from going to seed too early in the summer.

2. Potatoes

Sun	Full sun
Water	Consistent, deep watering
Height	18-24 in (45-60 cm)
Zone	3-9 (perennial grown as annual)

My favorite partnership in the vegetable garden. Bush beans and potatoes protect each other from their worst enemies. The beans repel the Colorado potato beetle, while the potatoes repel the Mexican bean beetle. I plant them in alternating rows in my wider in-ground beds. It saves me hours of hand-picking pests off the leaves.

Tip: Give them space. Plant your bush beans at least twelve inches (30 cm) away from the potato foliage so both root systems have room.

3. Sweet Corn

Sun	Full sun
Water	Heavy watering
Height	6-8 ft (1.8-2.4 m)
Zone	3-11 (annual)

A classic pairing that I learned from reading about traditional native gardens. Pole beans need support, and corn stalks are strong enough to act as natural trellises. In return, the beans fix nitrogen in the soil, which feeds the hungry corn roots. It is a beautiful system that saves you from buying expensive metal trellises. I use this method whenever I want to save space in my wooden raised beds. It works just as well as the setups I detail in my guide on pumpkin trellis ideas.

Tip: Wait to plant. Let the corn grow to about six inches (15 cm) tall before sowing your pole bean seeds so the stalks do not get pulled down by the young vines.

4. French Marigolds

Sun	Full sun
Water	Low to medium
Height	6-12 in (15-30 cm)
Zone	2-11 (annual)

I plant French marigolds in almost every bed, but they work wonders around my beans. Their strong scent repels pests, and their roots produce a compound that keeps harmful nematodes away. I tuck them into the corners of my raised beds. They add a bright splash of orange and yellow while keeping the root zone clean. According to the University of Minnesota Extension, marigolds are highly effective at attracting beneficial insects to the garden.

Tip: Choose French varieties. They produce more of the root compounds that protect against nematodes than larger African marigolds.

5. Nasturtiums

Sun	Full sun to part shade
Water	Medium, dry soil is fine
Height	12 in (30 cm) trailing
Zone	2-11 (annual)

My go-to sacrificial trap crop. Nasturtiums attract aphids and blackflies like a magnet, drawing them away from my bean vines. If I see aphids on my nasturtiums, I do not spray them. I let the pests stay there, which soon brings ladybugs and hoverflies to clean them up. It is an easy way to manage pests without chemicals (and it’s a great excuse to plant something pretty in the vegetable patch).

Tip: Plant them at the base of your pole bean trellises. The trailing vines will fill the space underneath the beans and keep the soil shaded.

The best garden partnerships are the ones where the plants do the hard work for you.

6. Rosemary

Sun	Full sun
Water	Low, drought-tolerant
Height	2-4 ft (60-120 cm)
Zone	7-10 (perennial)

This is one of my personal favorites for keeping beetles away. The highly aromatic oils in rosemary leaves mask the scent of green beans completely. I keep a few rosemary plants in weathered terracotta pots nearby, or plant them directly in my sunny herb borders. The woody scent keeps the air fresh and the pests confused. You can find more small-space companion layouts in my guide on how to grow zucchini vertically.

Tip: Do not overwater. Rosemary hates wet feet, so plant it in a sandy soil mix that drains quickly.

7. Cucumbers

Sun	Full sun
Water	Consistent, medium
Height	4-6 ft (1.2-1.8 m) vining
Zone	4-12 (annual)

Cucumbers and green beans share the same soil and water preferences. They grow well side-by-side, especially when trained up a trellis. The nitrogen fixed by the bean roots helps the cucumber leaves grow green and strong. I plant them together on a simple A-frame trellis to save space. It is a great way to double your harvest in a small bed. I use similar layouts when planting companion plants that boost cucumber growth.

Tip: Keep them harvested. Pick both crops daily once they start producing to keep the vines putting out new growth.

8. Radishes

Sun	Full sun to part shade
Water	Medium, consistent
Height	6 in (15 cm)
Zone	2-11 (annual)

I always plant radishes around my bush beans. They grow fast and are harvested long before the beans need the space. As a bonus, radish leaves act as a trap crop for flea beetles. The beetles chew on the radish tops, leaving the young bean leaves alone. It is a simple trick that has saved many of my spring crops.

Tip: Sow radish seeds every two weeks. This gives you a continuous harvest and keeps the trap crop active while the beans establish.

9. Leaf Lettuce

Sun	Part shade
Water	Consistent, medium
Height	6-12 in (15-30 cm)
Zone	3-11 (annual)

Lettuce gets bitter and goes to seed quickly in the hot summer sun. I plant my leaf lettuce directly under my tall pole bean trellises. The large bean leaves cast a gentle shade that keeps the soil cool. This keeps my lettuce crisp and sweet for weeks longer than lettuce planted in the open. It is a trick I use for all my leafy greens, including spinach and chard.

Tip: Use loose-leaf varieties. They handle the light shade better than head lettuce and allow you to pick individual leaves as you need them.

10. Catmint

Sun	Full sun to part shade
Water	Low, well-draining
Height	1-2 ft (30-60 cm)
Zone	3-8 (perennial)

A wonderful perennial that brings the garden alive. Catmint attracts dozens of native bees and pollinators to the yard. More pollinators mean better fertilization for your bean blossoms, which increases your overall yield. I plant a mound of catmint at the end of my vegetable beds. It grows back every year and needs almost no care once established.

Tip: Cut the plant back by half after the first flush of flowers fades. This encourages a second round of blooms in late summer.

What to Keep Far Away from Your Beans (Bad Companions)

Not every plant makes a good neighbor. There are a few plants you should never grow next to green beans.

Alliums (Onions, Garlic, Chives, Leeks)

This is the most critical rule in my garden. Alliums release a chemical compound into the soil that stunts the growth of legumes. It interferes with the beneficial bacteria that help bean roots fix nitrogen. Keep your onions and garlic in a completely separate bed. I make sure to follow this same rule when choosing pepper companion plants.

Fennel

Fennel is a poor companion for almost everything. It releases chemicals that slow the growth of neighboring plants and attracts pests. I grow mine in a separate pot far away from my vegetable beds.

My Top Pick for the Space

If you only have room for one companion plant, I’d go with Summer Savory. It does not take up much room, it keeps the beetles away, and it makes your beans taste better in the kitchen. It is the classic pairing for a reason.

If you have a larger trellis setup, try the sweet corn partnership. Watching the beans climb the stalks is one of my favorite sights in the summer garden. Just remember to give the corn a head start.

Common Questions

1. Can I plant pole beans and bush beans together?

You can, but they do not help each other. They will compete for root space and sunlight if planted too close. I prefer to keep them in separate sections of the bed so the tall pole beans do not shade out the bush varieties.

2. How close should companion plants be to my beans?

For herbs and flowers like marigolds, plant them about six to eight inches (15-20 cm) from the base of your beans. For larger plants like corn or potatoes, keep them twelve to eighteen inches (30-45 cm) apart to prevent root crowding.

3. Do companion plants really stop pests?

They help, but they are not a magic shield. Companion planting is about creating a balanced garden where pests are confused and beneficial insects do the work. You still need to keep an eye out for beetles, but you’ll find far fewer of them.

— Anh