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Lanceleaf ragweed

Ambrosia bidentata

Also called Southern Ragweed

Lanceleaf ragweed
Photo: Unknown author, Public domain

Lanceleaf ragweed is a wild annual herb from the central and eastern United States, growing up to about 100 cm tall, found mainly in the Mississippi Valley and eastern Great Plains. It is a weedy wind-pollinated plant rather than a garden ornamental, and it is grown only by accident or for study.

Family
Asteraceae (Daisy family)
Grows as
Annual
Light
Full sun
Water
Water when the top of the soil is dry; it grows as a weed on moist, disturbed ground.
Soil
Average garden or disturbed soil; tolerates poor soil.
Temperature
15–30 °C; tolerates frost only as a seedling, dies back with cold weather.
How easy
Easy
Safety
Mildly toxic: Pollen is a major cause of hay fever and allergic reactions in people sensitive to ragweed.
Native range
C. & E. U.S.A.
Climate
temperate

About

Ambrosia bidentata, the lanceleaf ragweed, is a North American species of plants in the family Asteraceae. It is native to the central and eastern parts of the United States, primarily the Mississippi Valley and the eastern Great Plains.

Ambrosia bidentata is an annual herb up to 100 cm (40 inches) tall. Leaves have only a few lobes compared to the complexly divided leaves of some related species, sometimes no lobes at all. Flower heads are small and inconspicuous, as the plant is wind-pollinated. The heads develop into spiny burs as the seeds ripen.

Other Ambrosia plants

Flatspine bur ragweed · Ambrosia leaf bur ragweed · Ambrosia arborescens · Annual ragweed · Silver bur ragweed · Rio Grande ragweed · San Diego bur ragweed · Weakleaf bur ragweed · Tucson bur ragweed · Triangle bur ragweed · Burrobush · Woolly fruit bur ragweed

Text excerpted from the Wikipedia article Ambrosia bidentata by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.

The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.

Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.

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