How to Grow Baby Bok Choy (Tat Soi)
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Baby Bok Choy (Tat Soi)
Brassica rapa subsp. narinosa
vegetableTat Soi is a fast-growing Asian brassica with dark green, spoon-shaped leaves arranged in a rosette pattern and tender white stems. Also called 'Tatsoi' or 'spoon mustard,' it matures quickly and is prized for its mild, slightly sweet flavor and delicate texture. Baby bok choy refers to young plants harvested at an immature stage, typically 3-4 weeks after planting.
When should you plant Baby Bok Choy (Tat Soi) 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 Baby Bok Choy (Tat Soi) timeline · Pittsburgh, PA (Zone 6b)
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Plant Baby Bok Choy (Tat Soi)
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 Baby Bok Choy (Tat Soi)
Around Jun 1≈ 45 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Baby Bok Choy (Tat Soi) dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 3-10; prefers cool-season growing in spring and fall
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Get my Baby Bok Choy (Tat Soi) timeline →Growth Stages
Seedling
7-10 daysTiny green cotyledons emerge, followed by first true leaves with characteristic spoon shape
Keep soil evenly moist; thin seedlings to proper spacing; provide consistent light and avoid damping off by ensuring good air circulation
Vegetative
14-21 daysRosette of spoon-shaped leaves develops; plant remains low and compact; stems thicken and whiten
Maintain consistent moisture and steady nitrogen; thin to final spacing if not done earlier; monitor for pests weekly
Pre-harvest
5-10 daysLeaves reach 4-6 inches long; rosette is full and tender; white stem bases are prominent and crisp
Continue consistent watering; reduce nitrogen if excessive leaf size desired; ready for baby harvest at this stage
Mature
10-14 daysRosette reaches 8-12 inches diameter; leaves are large and robust; plant may begin bolting in warm weather
Harvest promptly before bolting; increase watering during heat stress; provide afternoon shade in hot climates
Flowering/Bolting
Variable; accelerated by heatFlower stalk emerges from center; leaves become tougher and more bitter; plant transitions to seed production
Harvest immediately if tenderness is priority, or allow to flower if collecting seeds; pinch off flowers to extend leaf harvest
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Use floating row covers until plants are established; apply Bacillus thuringiensis (Bt) spray; hand-pick caterpillars; encourage parasitic wasps
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Deploy floating row covers; spray neem oil or insecticidal soap; use diatomaceous earth; reflective mulches deter adults
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Spray strong water jet to dislodge; use insecticidal soap; apply neem oil; introduce ladybugs or lacewings
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Use yellow sticky traps; spray insecticidal soap or neem oil; encourage beneficial insects; remove heavily infested leaves
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and
Hand-pick at night; set beer traps; create copper barriers; encourage ground beetles; apply diatomaceous earth around base
Uses
Stir-fry and Asian cuisine
CulinaryTat Soi is a staple in Asian cooking, prized for its tender, mild leaves and crisp white stems that remain firm after light cooking. Use whole baby plants or separate leaves and stems for different cooking times in woks, sautés, or steamed dishes. [source]
Fresh salads and raw preparations
CulinaryBaby bok choy's delicate texture and subtle sweetness make it ideal for fresh salads, wraps, and vegetable platters. The tender leaves require minimal preparation and add a pleasant crunch and visual appeal. [source]
Cancer prevention and antioxidant properties
MedicinalLike other brassicas, tat soi contains glucosinolates and isothiocyanates that research suggests may have anti-cancer properties. It is also rich in vitamins A, C, K, and calcium, supporting bone health and immune function. [source]
Soups and broths
CulinaryThe mild flavor and tender leaves dissolve easily into light broths and Asian soups, adding nutritional depth without overpowering other ingredients. Often used in miso, chicken, or vegetable-based soups. [source]
Quick, season-extending crop
HouseholdTat soi's rapid maturity (25-35 days for baby plants) and cool-season preference make it ideal for extending the spring and fall growing seasons, fitting into succession plantings and small-space gardens with ease. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
For baby bok choy, harvest entire plants when rosette reaches 3-4 inches diameter (25-35 days), cutting at soil level in early morning for maximum crispness and juiciness. For mature plants, harvest outer leaves once plant is 6-8 inches tall, cutting 1-2 inches above soil to allow regrowth. Use a sharp knife to prevent bruising. Harvest before bolting for best flavor; plants bolt quickly in temperatures above 75°F (24°C). Early morning harvest yields the crispest, most hydrated leaves.
Fun Facts
- 🌱 Tat Soi is sometimes called 'spoon mustard' because its deeply cupped leaves resemble tiny spoons, giving it a striking appearance in the garden and on the plate.
- 🌱 In traditional Chinese cuisine, tat soi has been cultivated for centuries and is known as 'tatsai' or 'tattersail,' appearing frequently in Cantonese cooking.
- 🌱 Baby bok choy can be planted every 2-3 weeks for continuous harvests throughout the cool season, making it one of the most productive vegetables for small garden spaces.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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