Western Ragweed

Western Ragweed
Western Ragweed
 James Leiker

Western Ragweed
Ambrosia psilostachya


Family Aster
Longevity Perennial
Height 1 - 2 feet

Bloom Period

March April May June July August September October
  • Description: Erect stems are branched. Leaves are deeply lobed and rough to the touch. Small, green flowers are inconspicuous. Male flowers, with yellow pollen, appear on stalks at the top of the stems. Female flowers are hidden in the axils of the upper leaves.
  • Comments: For people with hay-fever, ragweeds are a serious problem. Pollen, produced by the plants, is carried great distances by the wind. In pastures, ragweed is mostly ignored by cattle, but this plant has great ecological value for wildlife. Abundant and nutritious seeds remain available to wildlife throughout the winter. Moth larvae eat the foliage, as do numerous grasshopper species. These insects are important food for young grassland birds. Western Ragweed is common statewide.

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The Meadow
Text: Iralee Barnard
Design: Jim Mason