Choosing the right bok choy companion plants is one of the smartest decisions you can make for your vegetable garden. Planting bok choy with good companions can help deter pests and improve overall garden health. This guide gives you a clear, practical plan to grow healthier bok choy with less work.
Bok Choy Companion Plants
Companion planting is the practice of placing certain plants near each other to gain benefits. For bok choy, these benefits include natural pest control, better use of space, and improved soil conditions. The right neighbors can make a significant difference in your harvest.
The Core Benefits Of Companion Planting For Bok Choy
Bok choy, a fast-growing leafy green, is susceptible to pests like flea beetles, cabbage worms, and aphids. Strategic planting creates a more resilient garden ecosystem. You work with nature, not against it.
Natural Pest Deterrence
Many herbs and flowers emit strong scents that confuse or repel common bok choy pests. This reduces or eliminates the need for chemical sprays.
Improved Space and Soil Utilization
Companions can have different root depths or growth habits. This lets you grow more food in the same area without plants competing directly for nutrients.
Attraction of Beneficial Insects
Flowering companions draw in pollinators and predatory insects, like ladybugs and lacewings, which eat aphids and other pests.
Best Companion Plants For Bok Choy
These plants are known to support bok choy’s growth through various mechanisms. Grouping them together creates a powerful garden team.
Aromatic Herbs
Herbs with strong fragrances are excellent for masking the scent of bok choy from pests.
- Dill: Attracts beneficial wasps that prey on cabbage worms. Its tall, airy structure also provides light shade.
- Rosemary: Its potent scent is a known repellent for cabbage moths and flea beetles.
- Mint: Very effective at repelling ants and aphids. Be sure to plant mint in a container, as it can be invasive in garden beds.
- Thyme: A low-growing herb that forms a living mulch, suppressing weeds and deterring cabbage worms.
- Chamomile: Known as a “plant doctor,” it can improve the health and flavor of neighboring plants.
Flowering Companions
These flowers are not just pretty; they are hardworking garden protectors.
- Nasturtiums: A classic trap crop. Aphids and cabbage worms prefer nasturtiums, leaving your bok choy alone. They are edible, too.
- Marigolds: Their roots release a substance that suppresses nematodes in the soil. The flowers also repel various insects.
- Calendula: Attracts a wide range of pollinators and beneficial insects. It’s easy to grow from seed.
- Sweet Alyssum: This low-growing flower attracts hoverflies, whose larvae are voracious aphid eaters.
Vegetable Allies
Other vegetables can be mutually beneficial when planted near bok choy.
- Alliums (Onions, Garlic, Chives): The strong smell of alliums confuses many pests that target the cabbage family. Chives can help deter aphids.
- Beets and Spinach: These are light feeders with shallow roots, so they don’t compete heavily with bok choy for nutrients.
- Bush Beans: Beans fix nitrogen in the soil, which can benefit the leafy growth of bok choy. They also have a different growth form.
- Celery: Can help repel the white cabbage butterfly, a common pest for bok choy.
- Potatoes: While some sources list conflicts, many gardeners find bok choy and potatoes grow well together without issue.
- Other Brassicas (Broccoli, Cauliflower, Cabbage): They compete for the same nutrients and attract the same pests, creating a target-rich environment.
- Strawberries: They are heavy feeders and can attract slugs, which will also munch on bok choy.
- Tomatoes: They are also heavy feeders and their tall growth can shade out bok choy, which needs good sun.
- Fennel: It releases substances that inhibit the growth of many plants, including bok choy. Plant fennel in a seperate area.
- Row 1: Bok choy
- Row 2: Onions or garlic
- Row 3: Bok choy
- Row 4: Dill or nasturtiums
- Border: Plant a border of marigolds, thyme, or chives around the entire bok choy patch.
- Underplant: Plant low-growing herbs like thyme or sweet alyssum between bok choy plants to act as a living mulch.
Plants To Avoid Planting Near Bok Choy
Just as some plants help, others can hinder. Avoid planting bok choy near these:
Designing Your Bok Choy Companion Planting Layout
Planning your garden layout is key to success. Here are two effective methods.
Interplanting Rows
Alternate rows of bok choy with rows of companions. For example:
This pattern creates a scent barrier and breaks up monoculture.
Border and Underplanting
Use companion plants to edge your garden bed or fill spaces between bok choy plants.
Step-by-Step Guide To Planting Bok Choy With Companions
Follow these steps for a successful planting.
Step 1: Prepare Your Garden Bed
Choose a site with at least 6 hours of sun. Bok choy prefers well-draining, fertile soil amended with compost. Ensure the bed is free of weeds and debris.
Step 2: Plan Your Spacing
Bok choy needs about 6-12 inches between plants, depending on the variety. Mark where each plant will go, leaving room for companions. Remember, overcrowding leads to disease.
Step 3: Plant Your Companions First
It’s often easier to establish herbs and flowers first. Plant your aromatic herbs or flower seeds/seedlings according to their spacing needs.
Step 4: Plant Your Bok Choy
Transplant your bok choy seedlings or sow seeds directly into the spaces you’ve allocated. Water gently but thoroughly after planting.
Step 5: Mulch and Maintain
Apply a light layer of organic mulch, like straw, to retain moisture and suppress weeds. Water consistently, as bok choy prefers steady moisture.
Managing Common Bok Choy Pests With Companions
Even with companions, you might see some pests. Here’s how your plant allies help.
Flea Beetles
These tiny jumping beetles create small holes in leaves. Strong-scented herbs like rosemary, mint, and thyme can help mask your bok choy. A border of catnip can also be effective.
Cabbage Worms and Loopers
The larvae of white butterflies and moths. Plant dill and celery to repel the butterflies. Nasturtiums act as a sacrificial trap crop.
Aphids
Small sap-sucking insects that cluster on stems and undersides of leaves. Chives, mint, and dill deter them. Flowers like sweet alyssum and calendula attract ladybugs that eat aphids.
Slugs and Snails
They chew large, irregular holes in leaves. While not a companion plant solution, placing crushed eggshells or diatomaceous earth around plants can help. Avoid overly moist conditions.
Seasonal Considerations For Bok Choy Companions
Bok choy is a cool-season crop, best grown in spring and fall. Choose companions that thrive in the same conditions.
Spring Planting
In spring, focus on quick-growing companions that can establish before pest pressure peaks. Good choices include spinach, beets, dill, and calendula. You can start seeds indoors to get a head start.
Fall Planting
Fall is often easier for bok choy, as some pest populations decline. You can still use alliums, thyme, and fast-growing nasturtiums. Consider adding some chard as a companion.
Frequently Asked Questions
Can I plant bok choy next to lettuce?
Yes, lettuce is a good companion for bok choy. They have similar water and light needs, and lettuce grows quickly without competing aggressively. Lettuce can also provide a light shade cover for bok choy in warmer spring days.
What are the worst companion plants for bok choy?
The worst companions are other heavy-feeding brassicas (like cabbage and broccoli), strawberries, and tomatoes. Fennel is particularly allelopathic and should be kept far away from your bok choy patch.
How close should companion plants be to bok choy?
For most companions, planting within 12-18 inches is effective for pest masking and beneficial insect attraction. For living mulch plants like thyme, you can plant them right between bok choy plants. Just ensure all plants have enough space for air circulation to prevent disease.
Do bok choy companion plants really work?
While not a 100% foolproof solution, companion planting significantly reduces pest problems and creates a healthier, more balanced garden ecosystem. It is a proven, time-tested method used by organic gardeners for generations. Success depends on using the right plant combinations and maintaining overall garden health.
Can I grow bok choy in a container with companions?
Absolutely. Choose a large, wide container (at least 12 inches deep). Plant one or two bok choy plants in the center and surround them with compact herbs like thyme, chives, or dwarf marigolds. Ensure the pot has excellent drainage and water regularly, as containers dry out faster.