When to Plant Romanesco in DeWitt County, IL
Romanesco is a stunning brassica with a lime-green head composed of fractal-patterned spiraling florets. It has a nuttier, milder flavor than cauliflower.
DeWitt County, Illinois is in USDA Zone 5b. The average last spring frost is April 15 and the first fall frost is October 17, giving you a growing season of approximately 185 days.
At an elevation of 801 feet, DeWitt County receives approximately 31.8 inches of rainfall annually with predominantly silt loam soil. Summer highs average 84°F, so choose short-season varieties of Romanesco to ensure they mature before fall.
DeWitt County Soil Profile
Soil Type
Silt Loam
Soil pH
6.1-7
Drainage
Well Drained
Plant Planting Risk Windows
Percentages indicate frost risk at transplant. The 70% safe window means there is a 30% chance of frost after transplant — suitable for cold-hardy crops or gardeners with frost protection. The 90% safe window is best for tender plants.
Soil Compatibility in DeWitt County
How your county's soil matches Romanesco's growing requirements.
Soil pH
Your soil pH (6.1–7.0) is within Romanesco's preferred range (6.0–7.0).
Soil Texture
The silt loam soil in DeWitt County is excellent for Romanesco — good drainage, moisture retention, and nutrient holding capacity.
Drainage
Drainage is adequate for Romanesco.
Organic Matter
Organic matter is excellent (5.0%) — Romanesco will thrive.
How to Plant Romanesco
Fall planting: Sow 10 weeks before your first frost date for a fall harvest.
Succession Planting Romanesco
Sow every 8.6 weeks. Last sowing by Jul 09 to harvest before frost.
For a dedicated fall crop, sow by Aug 08.
Plant Water Budget
Romanesco Planting Timeline — DeWitt County, IL
Romanesco Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | March 11 | Mar 11 – Mar 25 |
| Transplant Outdoors | April 15 | Apr 15 – Apr 29 |
| Direct Sow | April 1 | Apr 1 – Apr 22 |
| Fall Sowing | August 8 | Aug 8 – Aug 22 |
| Harvest | July 1 | Jul 1 – Aug 12 |
Plant 1" deep · 15" apart · Rows 24" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | Start Indoors |
| April | Transplant Outdoors Direct Sow |
| May | — |
| June | — |
| July | Harvest |
| August | Fall Sowing Harvest |
| September | — |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
1"/week · 1-2 times/week
📅 Days to Maturity
75–100 days
🧪 Soil pH
Needs 6–7 · Your soil: ideal
🗺️ USDA Zone
Zone 5b
📆 Growing Season
185 days in DeWitt County
Growing Tips for Romanesco in DeWitt County
Direct sow Romanesco outdoors after April 15 in DeWitt County when soil has warmed and frost danger has passed.
Common pests for Romanesco in this region include cabbage worm and flea beetles. Use row covers early in the season and inspect plants weekly.
General growing tips
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.
Companion Planting
Good Companions
Avoid Planting Near
Level Up Your Garden
Romanesco in Other Locations
Frequently Asked Questions
When should I plant Romanesco in DeWitt County, IL?
DeWitt County is in Zone 5b with an average last frost of April 15. Plan your Romanesco planting based on this frost date — see the calendar above for exact timing.
What planting zone is DeWitt County, IL?
DeWitt County, Illinois is in USDA Hardiness Zone 5b. The average last spring frost is April 15 and first fall frost is October 17.
Plan Your Garden with Confidence
Get our free Garden Planner — designed to help DeWitt County gardeners in Zone 5b organize planting dates, track what's growing, and never miss a planting window.
Get Your Free Garden Planner →Free download. Plan your entire garden season in minutes.