How to Grow Gai Laan

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Gai Laan

Brassica oleracea var. alboglabra

vegetable

Gai laan, also known as Chinese broccoli, is a leafy green cruciferous vegetable prized in Asian cuisine for its tender stalks, small flowering heads, and slightly sweet, mild flavor. The plant features dark green leaves with edible flower buds that resemble miniature broccoli crowns. It matures quickly and is best harvested when young and tender.

Looking for a specific variety?

Hong Kong Green White Flowering Kai-Lan Chinese Kale Yu Choy Sum

When should you plant Gai Laan in your zone?

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Example Gai Laan timeline · Pittsburgh, PA (Zone 6b)

Plant Gai Laan
Around Apr 17

Near Pittsburgh's average last spring frost.
Tend & protect
Late spring–summer

Watering, feeding, and pest-watch reminders.
Harvest Gai Laan
Around Jun 1

≈ 45 days after planting

Sample dates for Pittsburgh, PA. Sign up to get exact Gai Laan dates for your own zip code.

Growing Conditions

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Sun: Full sun, 6-8 hours daily; tolerates partial shade in hot climates

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Water: Keep soil consistently moist but not waterlogged; provide 1-1.5 inches per week through rainfall or irrigation. Water more frequently during flowering to prevent bolting.

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Spacing: 8-12 inches

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Days to maturity: 45-60

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Planting depth: 0.25-0.5 inches for seeds; transplants at soil line

Soil

Type: Well-draining, fertile loamy soil rich in organic matter

pH: 6.0-7.5

Amendments:

Compost aged manure balanced fertilizer (10-10-10 or higher nitrogen) bone meal

Growing Zones

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Cool-season crop best grown in spring and fall; zones 4-9 ideal, but can be grown year-round in zones 9-10

2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b 10a 10b

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Growth Stages

Seedling

3-4 weeks

Tiny cotyledons emerge with first true leaves appearing within 7-10 days. Plant develops 4-6 leaves before reaching transplant size.

Keep soil moist; provide bright light if growing indoors. Thin seedlings to prevent crowding and strengthen remaining plants.

Vegetative Growth

2-3 weeks

Plant develops 6-12 true leaves and establishes strong root system. Stems thicken and foliage becomes dense and dark green.

Maintain consistent moisture and feed with nitrogen-rich fertilizer every 2-3 weeks. Mulch to retain moisture and regulate soil temperature.

Flower Bud Formation

1-2 weeks

Central flower head develops with small buds forming at the apex. Side shoots begin to emerge if main head is left unharvested.

Continue regular watering and fertilizing. Watch for pests and disease. In hot weather, provide afternoon shade to prevent premature bolting.

Flowering & Harvest-Ready

1-2 weeks

Small green flower buds mature and are ready for harvest. Buds remain tight and tender; leaves around the head are prime quality.

Harvest immediately when buds are compact but before flowers open. Cut main head to encourage side shoot development.

Post-Harvest Production

2-4 weeks

After main head removal, multiple side shoots develop with smaller flower heads, extending harvest season.

Continue watering and fertilizing. Harvest side shoots regularly to promote more branching and prolong productivity.

Companion Planting

Plan your garden →

Plant with:

garlic onions beets chard lettuce spinach dill chamomile marigold nasturtium

Avoid planting near:

tomatoes peppers potatoes fennel strawberries other brassicas (if space-constrained)

Common Pests

Use row covers before infestation; spray with Bacillus thuringiensis (Bt); hand-pick larvae; encourage parasitic wasps
Spray with strong water stream; apply insecticidal soap or neem oil; introduce ladybugs; use reflective mulch
Use row covers on young plants; apply diatomaceous earth; spray with neem oil; plant trap crops nearby
Use yellow sticky traps; spray with insecticidal soap; apply neem oil every 7-10 days; encourage beneficial insects
Improve soil drainage and pH; practice crop rotation (3-4 year); use resistant varieties if available; remove infected plants

Uses

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Stir-fries & Asian cooking

Culinary

Gai laan is a staple in Chinese cuisine, particularly in Cantonese cooking. The tender stalks, leaves, and flower buds are prized for stir-fries, soups, and braised dishes where they provide a slightly sweet, mild flavor with a pleasing texture. [source]

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Steaming & simple preparations

Culinary

The delicate flavor is best showcased through simple cooking methods like steaming with garlic and oyster sauce or blanching and serving with sesame oil. The entire plant is edible and tender, making it ideal for quick weeknight meals. [source]

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Nutritional & cancer-fighting compounds

Medicinal

Like all brassicas, gai laan contains glucosinolates and sulforaphane, compounds studied for potential anti-cancer and anti-inflammatory properties. It is also rich in vitamins A, C, and K, and minerals like calcium and iron. [source]

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Fresh vegetable green for everyday nutrition

Household

As a highly nutritious, quick-growing green, gai laan is an excellent addition to home gardens for consistent fresh produce throughout the growing season. Its fast maturity (45-60 days) makes it ideal for succession planting. [source]

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Pollinator and beneficial insect support

Wildlife

If allowed to flower, gai laan's small yellow blossoms attract bees, butterflies, and other pollinating insects, supporting garden biodiversity and ecosystem health. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

Harvest the main head when buds are tight and dark green, typically 45-60 days after planting. Cut 2-3 inches below the flower head with a sharp knife. Morning harvests after dew dries yield the crispest texture. Leave 3-4 inches of stem to encourage side shoot development. Side shoots can be harvested for 2-4 weeks after main head removal. For best flavor and tenderness, harvest before any flowers open. Plants are at peak quality when 6-8 inches tall.

Fun Facts

🌱 Gai laan means 'mustard greens' in Cantonese, though it is botanically a type of Chinese broccoli. It has been cultivated in southern China for over 2,000 years and is a cornerstone vegetable in Cantonese cuisine.
🌱 Unlike standard broccoli, gai laan produces edible side shoots prolifically after the main head is harvested, allowing a single plant to produce multiple harvests over several weeks.
🌱 Gai laan prefers cool temperatures and can actually develop superior flavor and texture in fall when grown in regions with mild winters, making it a perfect succession crop after summer vegetables.

Gardening Terms

New to gardening? Learn about terms used in this guide:

Bolt Crown Full Sun Mulch Partial Shade Transplant True Leaves

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