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How to Grow Tat Sai

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Tat Sai

Brassica rapa subsp. narinosa

vegetable

Tat Sai is a compact Asian leafy green with dark, spoon-shaped leaves that form a dense rosette. It is mild, tender, and slightly sweet with a subtle mustard flavor. This cool-season brassica is prized in Asian cuisine and grows quickly in cold weather.

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Example Tat Sai timeline · Pittsburgh, PA (Zone 6b)

  1. Plant Tat Sai

    Around Apr 17

    Near Pittsburgh's average last spring frost.

  2. Tend & protect

    Late spring–summer

    Watering, feeding, and pest-watch reminders.

  3. Harvest Tat Sai

    Around May 27

    ≈ 40 days after planting

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

Growing Conditions

☀️
Sun: Full sun to partial shade; 6-8 hours of direct sunlight daily, ideally with afternoon shade in hot climates
💧
Water: Keep soil consistently moist but not waterlogged. Provide 1-1.5 inches per week. Mulch to retain moisture and keep roots cool. More frequent watering needed in warmer weather.
📏
Spacing: 6-12 inches
📅
Days to maturity: 40-60
🌱
Planting depth: 0.25-0.5 inches (seeds); transplants at soil line

Soil

Type: Rich, well-draining loamy soil with good organic matter
pH: 6.0-7.5
Amendments:
Compost Aged manure Peat moss or coconut coir Nitrogen-rich fertilizer

Growing Zones

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Zones 3-9; prefers cool-season growing (fall, winter, spring)

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

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Growth Stages

1

Germination & Seedling

2-3 weeks

Seeds sprout within 5-10 days at soil temperatures of 50-70°F. Seedlings develop their first true leaves with the characteristic spoon shape becoming apparent.

Keep soil moist but not soggy. Provide bright light to prevent leggy growth. Thin seedlings to proper spacing once they have 2-3 true leaves. Protect from direct heat.

2

Vegetative Growth

3-4 weeks

Plant develops the dense rosette of dark green, spoon-shaped leaves. Leaf texture becomes tender and glossy. Plant remains low to the ground, typically 4-8 inches tall.

Maintain consistent moisture and feed with balanced fertilizer every 2-3 weeks. Remove any yellow or damaged leaves. Watch for pests and caterpillars. Mulch around the base to keep roots cool.

3

Maturity & Harvest-Ready

Variable; can harvest for 4-6 weeks

Rosette becomes full and compact with 12-20 tender leaves. Leaves maintain dark green color and spoon shape. Plant reaches 6-10 inches in diameter.

Continue regular watering and maintain cool conditions. Begin harvesting outer leaves once plant is well-established. Avoid letting plant bolt (go to seed), which is hastened by heat and long days.

4

Bolting (if allowed)

2-4 weeks

Plant elongates and sends up a flowering stalk with yellow flowers. Leaves become tougher, more peppery, and less desirable for eating.

Harvest before bolting for best quality. In cool seasons, bolting is delayed. If you wish to save seeds, allow bolting and let flowers develop and set seed pods.

Companion Planting

Plan your garden →

Plant with:

Carrot Radish Beet Dill Chamomile Onion Garlic Thyme Spinach Lettuce

Avoid planting near:

Tomato Potato Fennel Kohlrabi Cabbage Broccoli Cauliflower Kale Other Brassicas (can attract same pests)

Common Pests

  • Use row covers before planting. Handpick caterpillars. Apply Bt (Bacillus thuringiensis) or spinosad spray. Plant marigolds and dill nearby to attract parasitic wasps.

  • Use reflective mulch or row covers. Apply neem oil or kaolin clay spray. Handpick if infestation is light. Ensure adequate moisture to reduce stress.

  • Spray with strong water jet to dislodge. Apply insecticidal soap or neem oil. Encourage predatory insects like ladybugs and lacewings.

  • Place cardboard collars around seedlings. Apply diatomaceous earth around the base. Water soil in evening to reduce hiding spots.

  • and

    Hand-pick at dusk. Create barriers of copper tape. Beer traps or wood ash around plants. Encourage ground beetles and other predators.

Uses

🍳

Stir-Fries & Sautéed Dishes

Culinary

Tat Sai is a staple in Asian cuisine, particularly Chinese stir-fries. Its tender leaves and mild flavor work beautifully when lightly cooked with garlic, ginger, and sesame oil, and it holds its shape better than many other greens when sautéed. [source]

🍳

Fresh & Cooked Greens

Culinary

Young, tender leaves can be eaten raw in salads or cooked as a nutritious side dish. The spoon-shaped leaves are attractive raw and become silky when steamed or sautéed. [source]

💊

Cruciferous Vegetable Health Benefits

Medicinal

Like other brassicas, Tat Sai contains glucosinolates and isothiocyanates, compounds shown to have cancer-preventive and antioxidant properties. It is rich in vitamins A, C, and K. [source]

🏠

Winter Microgreens & Sprouts

Household

Tat Sai seeds can be sprouted indoors for microgreens that are packed with nutrition and flavor, offering a quick harvest of nutrient-dense greens. [source]

🦋

Pollinator & Beneficial Insect Support

Wildlife

If allowed to bolt, Tat Sai produces abundant small yellow flowers that attract bees, hoverflies, and other pollinators, supporting local ecosystems. [source]

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

Harvest Tips

Begin harvesting outer leaves when plant is 4-6 weeks old and leaves are 3-4 inches long; this encourages continued leaf production. Cut or pinch leaves from the outside of the rosette, leaving the center to grow. Harvest in the morning for crispest leaves. Can harvest the entire head by cutting at the base, or take individual leaves over several weeks. Tat Sai is best when tender and mild; harvest before hot weather causes bolting and bitterness. Peak flavor is in cool seasons (fall and spring).

Fun Facts

  • 🌱 Tat Sai, also known as 'Spoon Mustard' or 'Rosette Bok Choy,' is named for the spoon-like shape of its deep green leaves, which resemble tiny spoons arranged in a perfect rosette.
  • 🌱 Tat Sai thrives in the cool months and is one of the fastest-growing leafy greens, often ready for harvest in 4-6 weeks from direct seeding—faster than many other Asian greens.
  • 🌱 In traditional Chinese gardens and cuisine, Tat Sai has been cultivated for centuries and is highly valued for its tender texture and ability to grow densely, making it ideal for small-space gardening.

Gardening Terms

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

Bolt Full Sun Mulch Partial Shade True Leaves
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