This map is not available. Choose a map that is available from the list below.


Spirodela polyrhiza

Common Name(s): Great duckweed
Family: Lemnaceae
Growth Habit: Perennial
Invasiveness: Noxious weed:PR
Growing Days: 120
Precipitation: 12 to 55 (in.)
Winter Minimum: -38° (F)
Soil pH: 5.2 to 7.1
Soil Texture/Type: Fine to medium textured soils
Soil Drainage: Very Poor
Photoperiod Response:
Light Intensity:
Aquatic herb found in quiet permanent waters. No salt tolerance. No drought resistance. Medium to clay soils.
No diseases found for the ten pathogens searched.
Weed - , Animal Food - fodder


Geographical Origin:
Africa, Europe, North America, Australia, Southern Asia
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