Ragweed parthenium (Parthenium hysterophorus) is a non-native landscape weed indigenous to Central and South America and has rapidly spread to many parts of the world. This species is listed in the top 100 most invasive species in the world by the International Union for the Conservation of Nature. This weed is found along railway, pastures, grasslands, seasonal flood plains, woodlands, waste areas, disturbed natural sites, lawns, gardens and among crops. 

• Scientific Name: Parthenium hysterophorus 
• Common Name: Ragweed parthenium; Parthenium weed; Congress grass; Carrot weed 
• Seasonality: All-year
• Soil Type: Wet to dry
• Toxicity: Toxic (allergenic)
• Plant habit: Annual
• Biology and Management of Ragweed Parthenium (Parthenium hysterophorus L.) in Ornamental Crop Production
• Identification, Impacts, and Control of Ragweed Parthenium (Parthenium hysterophorus L.)
• Biology and Control of Ragweed Parthenium in Non-Cropland
• UF/IFAS Assessment of Non-Native Plants in Florida's Natural Areas

• Relevant Resources

  Biology and Management of Ragweed Parthenium (Parthenium hysterophorous L.) in Ornamental Crop Production EDIS Document 

  Biology and Control of Ragweed Parthenium in Non-Cropland EDIS Document 

  Identification, Impacts, and Control of Ragweed Parthenium (Parthenium hysterophorus L.) EDIS Document

  UF/IFAS Assessment of Non-Native Plants in Florida's Natural Areas

  Invasive Plant Atlas