How to Grow Kai Lan
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Kai Lan
Brassica oleracea var. alboglabra
vegetableKai Lan, also known as Chinese broccoli or gai lan, is a leafy green cruciferous vegetable with thick stalks, small flowering heads, and tender leaves. It has a mild, slightly sweet flavor and is popular in Asian cuisine. The entire plant—stalks, leaves, and florets—is edible and nutritious.
When should you plant Kai Lan in your zone?
Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.
Example Kai Lan timeline · Pittsburgh, PA (Zone 6b)
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Plant Kai Lan
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Kai Lan
Around Jun 1≈ 45 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Kai Lan dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 5-9; can be grown in cooler zones during spring and fall
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Get my Kai Lan timeline →Growth Stages
Seedling
2-3 weeksSmall cotyledons emerge, followed by true leaves; plant is delicate and low-growing
Keep soil consistently moist; provide bright light to prevent legginess; thin to strongest seedlings if direct seeding
Vegetative Growth
3-4 weeksPlant develops multiple thick stalks with long, bluish-green leaves; height reaches 8-12 inches
Thin plants to proper spacing; maintain consistent soil moisture; side-dress with compost or balanced fertilizer every 2-3 weeks
Bud Formation
1-2 weeksSmall broccoli-like flower heads begin to form at the top of stalks; leaves are fully developed
Continue regular watering and fertilizing; avoid stress from heat or drought; watch for pests
Flowering Bud Maturity
5-7 daysHeads reach harvestable size (2-4 inches), tightly budded, dark green color; stalks remain crisp
Monitor daily for harvest readiness; harvest in cool morning hours; maintain moisture for quality
Secondary Growth/Harvest
2-3 weeksAfter main head harvest, side shoots develop along the stalk, creating smaller secondary heads
Continue watering and harvesting secondary shoots regularly; can extend production 2-3 weeks
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Row covers on young plants; hand-pick; Bacillus thuringiensis (Bt) spray; netting to exclude butterflies
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Row covers; neem oil; diatomaceous earth; reflective mulches; ensure consistent soil moisture
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Strong water spray; insecticidal soap; neem oil; encourage beneficial insects like ladybugs
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Bt spray; row covers; spinosad if severe; crop rotation
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Improve soil drainage; lime to raise pH above 7.2; crop rotation (3+ years); remove infected plants
Uses
Stir-frying and Asian cooking
CulinaryKai Lan is a staple in Chinese, Vietnamese, and Thai cuisine, commonly stir-fried with garlic and oyster sauce. The entire plant—tender stalks, leaves, and florets—cooks quickly and maintains a pleasant crunch. [source]
Nutritious side dish
CulinaryRich in vitamins A, C, and K, calcium, and fiber. Can be steamed, boiled, blanched, or roasted as a healthy vegetable side. [source]
Anti-cancer compounds
MedicinalLike other brassicas, Kai Lan contains glucosinolates and sulforaphane, compounds studied for potential anti-cancer properties. Traditional medicine values it for supporting digestive health. [source]
Quick-growing seasonal crop
HouseholdIts 45-60 day maturity makes it ideal for spring and fall gardening, allowing multiple successions in temperate climates for continuous harvest. [source]
Raw or blanched salad ingredient
CulinaryYoung, tender Kai Lan can be enjoyed raw in salads with a mild, slightly sweet flavor, or blanched and chilled as a nutritious appetizer. [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 in the morning when heads are firm and tightly budded, before florets begin to flower. Cut the main head with 1-2 inches of stalk using a sharp knife. Secondary shoots will continue to develop; harvest regularly for 2-3 weeks. Kai Lan is most tender and flavorful when harvested at 2-4 inches of head size. Plants tolerate light frost and may have improved flavor after cool temperatures.
Fun Facts
- 🌱 Kai Lan means 'mustard greens' in Cantonese, though it's botanically a type of brassica distinct from mustard greens, with thicker, more tender stalks.
- 🌱 Unlike regular broccoli, Kai Lan produces multiple harvests from a single plant; after the main head is cut, the stalk continues to branch and produce smaller secondary heads for weeks.
- 🌱 Kai Lan thrives in cool weather and is actually sweeter after a light frost, as plants convert starches to sugars as a natural antifreeze—a quality prized in Asian markets.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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