Romanesco Planting Guide
Romanesco is a stunning brassica with a lime-green head composed of fractal-patterned spiraling florets. It has a nuttier, milder flavor than cauliflower.
Brassica oleracea var. botrytis · Vegetable · Brassicaceae family · 75–100 days to maturity
Get Your Personalized Romanesco Planting Dates
Enter your ZIP code to see exact planting dates, soil compatibility, and growing tips specific to your county.
Where Can You Grow Romanesco?
Romanesco Growing Regions
Click any state to see the Romanesco planting schedule for that location.
Planting Dates by Zone
| Zone | Start Indoors | Direct Sow | Transplant | Harvest |
|---|---|---|---|---|
| Zone 3a | Apr 3 | May 8 | May 15 | Jul 31 – Sep 11 |
| Zone 3b | Mar 29 | May 3 | May 10 | Jul 26 – Sep 6 |
| Zone 4a | Mar 25 | Apr 29 | May 6 | Jul 22 – Sep 2 |
| Zone 4b | Mar 20 | Apr 24 | May 1 | Jul 17 – Aug 28 |
| Zone 5a | Mar 21 | Apr 11 | Apr 25 | Jul 11 – Aug 22 |
| Zone 5b | Mar 14 | Apr 4 | Apr 18 | Jul 4 – Aug 15 |
| Zone 6a | Mar 6 | Mar 27 | Apr 10 | Jun 26 – Aug 7 |
| Zone 6b | Feb 27 | Mar 20 | Apr 3 | Jun 19 – Jul 31 |
| Zone 7a | Feb 18 | Mar 11 | Mar 25 | Jun 10 – Jul 22 |
| Zone 7b | Feb 11 | Mar 4 | Mar 18 | Jun 3 – Jul 15 |
| Zone 8a | Feb 1 | Feb 22 | Mar 8 | May 24 – Jul 5 |
| Zone 8b | Jan 21 | Feb 11 | Feb 25 | May 13 – Jun 24 |
| Zone 9a | Jan 13 | Jan 20 | Feb 10 | Apr 28 – Jun 9 |
| Zone 9b | Dec 28 | Jan 4 | Jan 25 | Apr 12 – May 24 |
| Zone 10a | Dec 4 | Dec 11 | Jan 1 | Mar 19 – Apr 30 |
| Zone 10b | Dec 4 | Dec 11 | Jan 1 | Mar 19 – Apr 30 |
Why are some columns showing "—"?
Transplant shows "—" because Romanesco is best direct sown where it will grow. Transplanting can disturb the roots and slow growth.
How to Plant Romanesco
🍂 Fall planting: Sow 10 weeks before your first frost date for a fall harvest.
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
Moderate — regular watering
Water when the top inch of soil feels dry. Consistent moisture produces the best results.
🧪 Soil pH
6 – 7
Prefers neutral to slightly acidic soil — ideal for most garden beds.
🗺️ Hardiness Zones
Zone 3a – 10b
📅 Days to Maturity
75–100 days
Medium-season crop. Start early for best results in shorter seasons.
👪 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 Romanesco
Romanesco matures in just 75–100 days, making it ideal for succession planting. In a typical 180-day growing season, you can get up to 2 successive plantings by sowing every 8.6 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 Romanesco
✅ Good Companions
❌ Keep Away From
Check more combinations with our Companion Planting Checker →
Growing Tips for Romanesco
Start seeds indoors 5-7 weeks before transplanting. Provide consistent moisture and avoid temperature stress. Harvest when head is fully formed but before florets begin to separate.
Saving Romanesco 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
Romanesco 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 Romanesco?
Romanesco (Brassica oleracea var. botrytis) takes 75 to 100 days from planting to harvest. Exact timing depends on your variety, growing conditions, and USDA zone.
What zones can Romanesco grow in?
Romanesco can be grown in USDA zones 3a through 10b. Use the planting calendar above to find the exact dates for your zone.
How much sun does Romanesco need?
Growing Romanesco requires Full Sun (6-8+ hours), Moderate — regular watering, and soil pH of 6 to 7.