Komatsuna Planting Guide
Komatsuna (Japanese mustard spinach) is a versatile Asian green with glossy, dark leaves and a mild, sweet flavor. It is extremely cold-hardy and heat-tolerant.
Brassica rapa var. perviridis · Vegetable · Brassicaceae family · 35–50 days to maturity
Get Your Personalized Komatsuna Planting Dates
Enter your ZIP code to see exact planting dates, soil compatibility, and growing tips specific to your county.
Where Can You Grow Komatsuna?
Komatsuna Growing Regions
Click any state to see the Komatsuna planting schedule for that location.
Planting Dates by Zone
| Zone | Start Indoors | Direct Sow | Transplant | Harvest |
|---|---|---|---|---|
| Zone 2a | Apr 18 | May 23 | May 30 | Jul 4 – Aug 8 |
| Zone 2b | Apr 10 | May 15 | May 22 | Jun 26 – Jul 31 |
| Zone 3a | Apr 3 | May 8 | May 15 | Jun 19 – Jul 24 |
| Zone 3b | Mar 29 | May 3 | May 10 | Jun 14 – Jul 19 |
| Zone 4a | Mar 25 | Apr 29 | May 6 | Jun 10 – Jul 15 |
| Zone 4b | Mar 20 | Apr 24 | May 1 | Jun 5 – Jul 10 |
| Zone 5a | Mar 21 | Apr 11 | Apr 25 | May 30 – Jul 4 |
| Zone 5b | Mar 14 | Apr 4 | Apr 18 | May 23 – Jun 27 |
| Zone 6a | Mar 6 | Mar 27 | Apr 10 | May 15 – Jun 19 |
| Zone 6b | Feb 27 | Mar 20 | Apr 3 | May 8 – Jun 12 |
| Zone 7a | Feb 18 | Mar 11 | Mar 25 | Apr 29 – Jun 3 |
| Zone 7b | Feb 11 | Mar 4 | Mar 18 | Apr 22 – May 27 |
| Zone 8a | Feb 1 | Feb 22 | Mar 8 | Apr 12 – May 17 |
| Zone 8b | Jan 21 | Feb 11 | Feb 25 | Apr 1 – May 6 |
| Zone 9a | Jan 13 | Jan 20 | Feb 10 | Mar 17 – Apr 21 |
| Zone 9b | Dec 28 | Jan 4 | Jan 25 | Mar 1 – Apr 5 |
| Zone 10a | Dec 4 | Dec 11 | Jan 1 | Feb 5 – Mar 12 |
| Zone 10b | Dec 4 | Dec 11 | Jan 1 | Feb 5 – Mar 12 |
| Zone 11a | Dec 4 | Dec 11 | Jan 1 | Feb 5 – Mar 12 |
| Zone 11b | Dec 4 | Dec 11 | Jan 1 | Feb 5 – Mar 12 |
Why are some columns showing "—"?
Transplant shows "—" because Komatsuna is best direct sown where it will grow. Transplanting can disturb the roots and slow growth.
How to Plant Komatsuna
🍂 Fall planting: Sow 10 weeks before your first frost date for a fall harvest.
Growing Conditions
☀️ Sun
Partial Shade (3-6 hours)
💧 Water
Moderate — regular watering
Water when the top inch of soil feels dry. Consistent moisture produces the best results.
🧪 Soil pH
6 – 7.5
Prefers neutral to slightly acidic soil — ideal for most garden beds.
🗺️ Hardiness Zones
Zone 2a – 11b
📅 Days to Maturity
35–50 days
Quick-growing crop. Multiple plantings per season are possible.
👪 Plant Family
Brassicaceae
Rotate with other families yearly to prevent soil-borne diseases. Don't plant in the same spot where Brassicaceae family crops grew last year.
Succession Planting Komatsuna
Komatsuna matures in just 35–50 days, making it ideal for succession planting. In a typical 180-day growing season, you can get up to 6 successive plantings by sowing every 4 weeks.
Your actual succession count depends on your local frost dates. Enter your ZIP code to get personalized succession planting dates for your area.
Companion Planting for Komatsuna
✅ Good Companions
❌ Keep Away From
Check more combinations with our Companion Planting Checker →
Growing Tips for Komatsuna
Direct sow in spring or fall. One of the most forgiving Asian greens for all seasons. Harvest outer leaves or cut whole plants. Excellent for stir-fries, soups, or salads.
Saving Komatsuna Seeds
Recommended for Your Garden
Start seeds indoors with reusable cell trays and humidity domes.
Test your soil pH, nitrogen, phosphorus, and potassium levels before planting.
Keep your garden organized with durable, weather-resistant plant labels.
Level Up Your Garden
Komatsuna by State
- Alabama
- Alaska
- Arizona
- Arkansas
- California
- Colorado
- Connecticut
- Delaware
- Florida
- Georgia
- Hawaii
- Idaho
- Illinois
- Indiana
- Iowa
- Kansas
- Kentucky
- Louisiana
- Maine
- Maryland
- Massachusetts
- Michigan
- Minnesota
- Mississippi
- Missouri
- Montana
- Nebraska
- Nevada
- New Hampshire
- New Jersey
- New Mexico
- New York
- North Carolina
- North Dakota
- Ohio
- Oklahoma
- Oregon
- Pennsylvania
- Rhode Island
- South Carolina
- South Dakota
- Tennessee
- Texas
- Utah
- Vermont
- Virginia
- Washington
- West Virginia
- Wisconsin
- Wyoming
Frequently Asked Questions
How long does it take to grow Komatsuna?
Komatsuna (Brassica rapa var. perviridis) takes 35 to 50 days from planting to harvest. Exact timing depends on your variety, growing conditions, and USDA zone.
What zones can Komatsuna grow in?
Komatsuna can be grown in USDA zones 2a through 11b. Use the planting calendar above to find the exact dates for your zone.
How much sun does Komatsuna need?
Growing Komatsuna requires Partial Shade (3-6 hours), Moderate — regular watering, and soil pH of 6 to 7.5.