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SuNutri
Napa Cabbage
Intermediate

Napa Cabbage

Brassica rapa subsp. pekinensis

Family: Brassicaceae

Napa cabbage (Chinese cabbage) forms tall, cylindrical heads with crinkled leaves. Its mild, slightly sweet flavor and tender texture make it essential for kimchi, stir-fries, and Asian soups.

Days to Harvest

55-80 days

Sun Needs

Full Sun to Part Shade (4-6 hours)

Water Needs

high

Germination Temp

65°F optimal

Seed Starting

Start Indoors

4 weeks before last frost

Germination

4-10 days

Seed Depth

1/4 inch

Light to Germinate

No

đź’ˇ Tip: Best as a fall crop. Spring plantings often bolt in long days.

Growing Conditions

Soil Type

Rich, well-draining, moisture-retentive soil

pH Range

6 - 7.5

Spacing

12-18 inches between plants

Companion Plants
âś“ Beetsâś“ Onionsâś“ Celery

⚠️ Avoid planting near:

âś— Tomatoesâś— Strawberries
History & Nutrition

History

Napa cabbage emerged in northern China somewhere between the 5th and 15th centuries, likely as a natural hybrid between bok choy and turnip. The name "napa" derives from the Japanese word "nappa," meaning leafy vegetable, though in Chinese it is called "da baicai" (big white vegetable) or "Tianjin cabbage." For centuries it remained a northern Chinese specialty, well-suited to the cooler climate. The vegetable's transformation into a global staple began with Korean kimchi—Napa cabbage arrived in Korea around the 15th century, eventually replacing earlier varieties to become the essential ingredient in the nation's defining fermented dish. By the 18th century, Korean farmers had developed specific cultivars ideal for kimchi production. Japanese cuisine embraced napa cabbage for nabemono (hot pot dishes), while it became integral to northern Chinese dumplings and stir-fries. Immigration waves brought the vegetable to Western countries in the late 19th century, though mainstream popularity only developed in the latter half of the 20th century. Today napa cabbage is cultivated worldwide, prized for its quick growth, mild sweetness, and remarkable versatility in both raw and cooked preparations.

Nutritional Benefits

  • âś“High in Vitamin C
  • âś“Good source of folate
  • âś“Contains Vitamin K
Climate & Temperature

Optimal Growing Temp

60°F - 70°F

Napa cabbage thrives in cool conditions between 60-70°F. It bolts very quickly in warm weather—even a few days above 75°F can trigger flowering. Fall plantings are far more successful than spring in most climates.

Survival Range

35°F - 75°F

Can survive these temperatures

hardy
cool Season

Frost Note: Napa cabbage tolerates light frosts down to 25°F, which can improve sweetness. Heads are more cold-hardy than young plants. In mild climates, it can be grown through winter.

Best USDA Zones

Zone 4Zone 5Zone 6Zone 7Zone 8

Humidity

50-70%

Moderate humidity is ideal. High humidity can promote fungal diseases in the tight head. Good air circulation helps prevent soft rot.

Plant Size & Growth

Height

12-18 inches

Spread

12-15 inches

Growth Habit

upright

biennialRoot Depth: Napa cabbage has a relatively shallow root system, with most roots in the top 8-12 inches. The tall, narrow head sits on a compact root base.
Growth Stages

Germination

4-8 days

Seeds germinate quickly at 50-75°F, with optimal germination around 65°F.

Seedling Stage

Duration: 3-4 weeks

True leaves: First true leaves appear 5-7 days after sprouting with crinkled, pale green appearance

Transplant ready: Ready to transplant when 3-4 inches tall with 4-5 true leaves. Direct sowing often works better to avoid transplant shock.

Vegetative Growth

Duration: 4-6 weeks

Rapid leaf development forms the characteristic upright, cylindrical head with crinkled, pale green to white leaves.

Flowering

Timing: Bolts quickly with heat, long days, or stress

Duration: Once bolting starts, quality declines rapidly

Yellow flowers appear on a central stalk. Napa cabbage is extremely bolt-prone in warm conditions.

Harvest Maturity

Timing: 50-80 days from seed depending on variety

  • Head is firm when squeezed from the top
  • Typical cylindrical or barrel shape is well-formed
  • Inner leaves are pale yellow-white and tightly wrapped
  • Outer leaves are pale green and may loosen slightly
  • No elongation of center (sign of bolting)
Expected Yield

Per Plant

2-5 lbs per head depending on variety

Per Square Foot

1-2 lbs per square foot

Harvest Frequency

One head per plant

Factors Affecting Yield

  • •Temperature during head formation is the key factor
  • •Fall crops consistently outperform spring crops
  • •Consistent moisture produces tender, mild heads
  • •Bolt-resistant varieties extend the growing window
  • •Direct sowing reduces transplant-related bolting
Watering Guide

Seedling Stage

Keep consistently moist—Napa cabbage needs steady moisture from germination

Established Plants

1-1.5 inches per week, maintaining even soil moisture

During Fruiting

Consistent moisture during head formation—stress triggers bolting

Preferred Method

Water at soil level with drip irrigation. Avoid wetting leaves to reduce disease. Morning watering is best.

⚠️ Critical Watering Periods

  • • Entire growing period—Napa cabbage is unforgiving of stress

Pro Tips

  • Consistent moisture is critical—water stress triggers bolting
  • Mulch to maintain even soil moisture and cool soil
  • Never let plants wilt—damage is immediate
  • Tip burn (brown edges on inner leaves) often indicates calcium uptake issues from inconsistent watering
Fertilizing Guide
moderate feederRecommended: Balanced (10-10-10) to slightly higher nitrogen for leafy growth

Feeding Schedule

At Planting

Balanced fertilizer worked into soil

Once at planting

Mid-Growth

Side-dress with nitrogen

Once, 3-4 weeks after planting

Organic Options

CompostFish emulsionBlood mealWorm castings

Work compost into soil before planting. Side-dress with fish emulsion at mid-growth. Napa cabbage is not as heavy a feeder as heading cabbage.

Container Growing
âś“ Suitable for containers

Minimum Size

5 gallon minimum

Recommended Size

7-10 gallon for full-sized heads

Depth Required

At least 10 inches deep

Best Varieties for Containers

Minuet (mini)Little Jade (mini)Tokyo Bekana

Container Tips

  • Container growing works well for Napa cabbage's compact root system
  • Choose mini varieties like Minuet for smaller containers
  • Keep containers in coolest location available
  • Fall planting is essential for container success
  • Water consistently—containers dry faster
  • Move to shade if unexpected warm spell occurs
✂️
Pruning Guide
Pruning Optional

Why Prune

Removing damaged outer leaves

When

As needed throughout the season

How Often

Rarely needed—Napa cabbage grows too fast for much pruning

Technique

Remove only damaged or yellowed outer leaves at the base.

Remove

  • âś— Damaged or diseased leaves
  • âś— Yellowed outer leaves

Keep

  • âś“ All healthy leaves—they form the head
Succession Planting

Plant Every

2 weeks

Sowings/Season

2-3 fall plantings

Duration

Fall only: 10-12 weeks before first frost through first frost

Tips

  • Succession plant only in fall when temperatures are cooling
  • Spring succession usually fails due to bolting
  • Stagger plantings 2 weeks apart for continuous fall harvest
  • In mild climates, continue planting into early winter
Frequently Asked Questions

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