This map shows the overall suitability of this crop in the state of Illinois.
Overall Suitability Map
Click for Large Map


Allium cepa var. cepa
Synonyms: A. cepa

Common Name(s): Onion
Family: Liliaceae
Growth Habit: Func. Annual/Biennial
Growing Days: 85 to 175 (days)
Abs.Max=84° (F)    Opt.Max=75° (F)
Opt.Min=54° (F)    Abs.Min=45° (F)
Precipitation: 14 to 24 (in.)
Winter Minimum: 28° (F)
Soil pH: 6 to 7
Soil Texture/Type: Sandy, muck, or acid peat soil
Soil Drainage: Well
Photoperiod Response: Long day, short day and day neutral
Light Intensity: Clear
Best in cool temperatures during early growth and fairly high temps during bulbing, harvesting, and curling. Avoid heavy soils that crust. Best on acidic, sandy or muck soil.
Pythium, Phytothora, Sclerotinia, Cercospora, Rhizoctonia, Rust
Additive - flavoring, Food - vegetable
Temperate, steppe and semi-arid, tropical-rainy, subtropical
Geographical Origin:
Only cultivated
Metric Units

Return to Search Results

| Alternative Crops Home | General Information | Methods | Quick Guide | Select Crop |
| Map Search | Crop List | County Search | Disclaimer | Links | Citations | Site Map |

| Home | Highlights | Staff | Data | Information | Centers | Site Map |
University of Illinois at Urbana-Champaign logo Illinois State Water Survey, Contact Information
University of Illinois at Urbana-Champaign
All files and information © 2018 Illinois State Water Survey. Terms of use.
Email the Web Administrator with questions or comments.
Last Modified: October 17, 2012
Illinois State Water Survey illinois state Water survey Alternative Crop Suitability Maps Site Map Alternative Crop Suitability Maps Contact Information Illinois Council on Food and Agricultural Research Illinois Department of Natural Resources Alternative Crop Suitability Maps