Tatsoi
Brassica rapa var. narinosa
Round, gently cupped green leaves with light green and white stems. Mild flavor. Crunchy, juicy stems. Fastest tatsoi to bolt. USDA Certified Organic.
Harvest
40-50d
Days to harvest
Sun
Full sun to partial shade
Zones
5–10
USDA hardiness
Height
3 feet
Planting Timeline
Showing dates for Tatsoi in USDA Zone 7
All Zone 7 brassica →Zone Map
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Tatsoi · Zones 5–10
Growing Details
Zone-by-Zone Planting Calendar
| Zone | Indoor Start | Transplant | Direct Sow | Harvest |
|---|---|---|---|---|
| Zone 3 | March – April | May – June | May – June | June – October |
| Zone 4 | March – April | May – June | April – June | June – October |
| Zone 5 | February – March | April – May | April – May | May – November |
| Zone 6 | February – March | April – May | April – May | May – November |
| Zone 7 | February – March | April – May | March – May | May – November |
| Zone 8 | January – February | March – April | March – April | April – December |
| Zone 9 | January – January | February – March | February – March | March – December |
| Zone 10 | January – January | February – March | January – March | March – December |
Complete Growing Guide
Start by preparing your planting site with well-draining soil enriched with 2-3 inches of compost or aged manure. Tatsoi thrives in slightly alkaline conditions with a pH between 6.0-7.5, so test your soil and amend with lime if needed. Choose a location that receives morning sun but benefits from afternoon shade in hot climates, as tatsoi can bolt prematurely in intense heat.
Direct sowing works best for tatsoi since it doesn't transplant well due to its taproot. Plant seeds ¼ inch deep and space them 4-6 inches apart in rows 8-10 inches wide. For zones 3-6, sow in early spring 2-3 weeks before your last frost date, then again in late summer for fall harvest. In zones 7-9, focus on fall through early spring plantings, avoiding the hottest months. Succession plant every 2-3 weeks for continuous harvests.
Keep soil consistently moist but not waterlogged – tatsoi needs about 1 inch of water weekly. Apply a balanced organic fertilizer (10-10-10) at planting, then side-dress with nitrogen-rich fertilizer like fish emulsion every 3 weeks during active growth. Mulch around plants with straw to retain moisture and suppress weeds, keeping mulch 2 inches from plant centers to prevent slug issues.
Avoid the common mistake of planting too thickly – overcrowded tatsoi develops weak, spindly leaves instead of robust rosettes. Thin seedlings to proper spacing when they're 2 inches tall. Never cultivate deeply around established plants as this damages their shallow feeder roots. Instead, hand-pull weeds or use a stirrup hoe very lightly.
To maximize yields, harvest outer leaves regularly once plants reach 4 inches across, leaving the growing center intact. This encourages continuous production for 6-8 weeks. In fall plantings, light frosts actually improve flavor by concentrating sugars, so don't rush to harvest before cold weather hits.
Harvesting
Begin harvesting tatsoi when the rosettes reach 3-4 inches across, typically 40-50 days from seeding. Look for deep green, glossy leaves that feel thick and succulent when gently squeezed. The spoon-shaped leaves should be firm and crisp, without yellowing or tough stems.
For continuous harvest, cut individual outer leaves at the base using clean scissors, leaving the central growing point undisturbed. This allows the plant to keep producing new leaves for several weeks. Alternatively, harvest entire young plants by cutting at soil level when rosettes are 4-6 inches across.
Harvest in early morning when leaves are fully hydrated and crisp. Avoid harvesting during hot afternoon sun when leaves may be wilted. After light frosts, wait until leaves have warmed and perked up before cutting. Cold-kissed leaves will be noticeably sweeter than those harvested before frost exposure. Handle gently to prevent bruising the tender leaves.
Storage & Preservation
Fresh tatsoi keeps best when stored unwashed in perforated plastic bags in your refrigerator's crisper drawer at 32-35°F with high humidity. Properly stored, it maintains quality for 7-10 days, though it's best used within 5 days for optimal texture and flavor.
For longer preservation, blanch leaves in boiling water for 2 minutes, plunge into ice water, drain thoroughly, and freeze in airtight containers for up to 8 months. Tatsoi also ferments beautifully – chop leaves and ferment with 2% salt by weight for a tangy kimchi-style preserve. Unlike heartier greens, tatsoi doesn't dehydrate well due to its high water content. For immediate use, store harvested leaves in cold water like cut flowers to maintain crispness for several hours before cooking.
History & Origin
Tatsoi (Brassica rapa var. narinosa) originates from the Yangtze River region of China, where it has been cultivated for over 1,000 years. Also known as tat choy, spoon mustard, or rosette bok choy, this ancient Asian green was traditionally grown in cool mountain valleys where its cold tolerance made it invaluable for winter nutrition.
The name 'tatsoi' comes from the Mandarin 'ta ts'ai,' meaning 'collapsed vegetable,' referring to its distinctive flat, ground-hugging growth habit. Chinese farmers developed this variety through generations of selection for plants that could survive harsh winters while maintaining tender, flavorful leaves.
Tatsoi remained largely unknown in Western gardens until the 1980s when specialty seed companies began importing Asian vegetables for adventurous American gardeners. Its introduction coincided with growing interest in stir-fry cooking and diverse salad greens. Today, it's prized by both home gardeners and restaurant chefs for its unique appearance, mild flavor, and exceptional cold hardiness that surpasses most other Asian greens.
Advantages
- +Exceptional cold tolerance – survives temperatures down to 15°F while other greens fail
- +Becomes sweeter and more flavorful after frost exposure
- +Compact rosette form makes efficient use of garden space
- +Fast growing with harvest possible in just 40 days
- +Cut-and-come-again harvesting extends productivity for 6-8 weeks
- +Naturally resistant to most common brassica diseases
- +Unique spoon-shaped leaves add visual interest to salads and dishes
Considerations
- -Bolts quickly in hot weather above 75°F
- -Attracts flea beetles which can riddle young leaves with holes
- -Doesn't transplant well due to sensitive taproot
- -Short storage life compared to heartier greens like kale
- -Can develop bitter flavor if water-stressed during growth
Companion Plants
Plant Together
Lettuce
Shares similar growing conditions and doesn't compete for nutrients
Spinach
Compatible growth habits and both benefit from cool weather
Radishes
Quick-growing radishes help break up soil and deter flea beetles
Onions
Strong scent deters cabbage worms and aphids that attack brassicas
Garlic
Natural pest deterrent, repels cabbage maggots and aphids
Dill
Attracts beneficial insects like parasitic wasps that control cabbage pests
Marigolds
Repel nematodes and various garden pests through natural compounds
Nasturtiums
Act as trap crop for aphids and flea beetles, drawing them away from tatsoi
Keep Apart
Tomatoes
Heavy feeders that compete for nutrients and may stunt brassica growth
Strawberries
Different water and nutrient requirements can inhibit brassica development
Pole Beans
Can shade low-growing tatsoi and compete for soil nutrients
Nutrition Facts
Per 100g serving. % Daily Value based on 2,000 calorie diet. Source: USDA FoodData Central (FDC #747447)
Pests & Disease Resistance
Resistance
Very cold hardy, tolerates frost well, generally disease resistant
Common Pests
Flea beetles, aphids, cabbage worms, leaf miners
Diseases
Downy mildew, white spot, clubroot, black rot