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NC Native Plant Society:
Plant Details

Ambrosia trifida

Giant Ragweed

Scientific Name:

Ambrosia trifida

Genus:

Ambrosia

Species Epithet:

trifida

Common Name:

Giant Ragweed

Plant Type

Herb/Wildflower

Life Cycle

Annual (Herbs Only)

Plant Family

Asteraceae (Aster Family)

Native/Alien:

NC Native

Invasive Status:

(*Key)

Size:

3-6 ft., 6-12 ft.

Bloom Color(s):

Green

Light:

Sun - 6 or more hours of sun per day, Part Shade - 2 to 6 hours of sun per day

Soil Moisture:

Dry, Moist

Bloom Time:

July, August, September, October, November

Growing Area:

Mountains, Piedmont, Coastal Plain

Habitat Description:

Floodplains, moist pastures; disturbed ground. Common in NC mountains and piedmont, rare in coastal plain.

Leaf Arrangement:

Opposite

Leaf Retention:

Deciduous

Leaf Type:

Leaves veined, not needle-like or scale-like

Leaf Form:

Simple

Life Cycle:

Annual (Herbs Only)

Wildlife Value:

Has some wildlife value

Landscape Value:

Not Recommended for home landscapes

State Rank:

S5: Secure (*Key)

Global Rank:

G5 - Secure (*Key)

Notes:

Produces large amounts of wind-borne pollen that trigger allergies in many people. Because all parts of the plant are green, many people overlook ragweed and blame the showy goldenrods, which bloom at the same time, for their allergies; goldenrod pollen, however, is primarily insect-borne, and is not the main cause of fall allergies.

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Links:

USDA PLANTS Database Record

Go Botany: https://gobotany.nativeplanttrust.org/species/ambrosia/trifida/

Vascular Plants of NC: https://auth1.dpr.ncparks.gov/flora/species_account.php



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