giant hogweed USDA PLANTS Symbol: HEMA17
U.S. Nativity: Exotic
Habit: Forbs/Herbs
Heracleum mantegazzianum Sommier & Levier

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Taxonomic Rank: Magnoliopsida: Apiales: Apiaceae
Native Range: Caucasus (BAIL);

Giant hogweed is a tall (up to 15-20 ft. [4.6-6.1 m]), herbaceous, biennial plant that invades disturbed areas across both the Northeast and Pacific Northwestern United States. Giant hogweed is designated as a Federal Noxious Weed, because it produces sap that causes skin sensitivity to UV radiation and leads to blistering and severe burns. The large stem is hollow and usually marked with purple blotches. The leaves are deeply lobed, sharply pointed, and up to 5 ft. (1.5 m) wide. Flowering occurs in late spring to early summer. The white flowers are on a large umbrella-shaped head at that can be up to 2.5 ft. (0.8 m) in diameter. Giant hogweed can invade a variety of habitats but prefers moist, disturbed soils such as riverbanks, ditches and railroad right-of-ways. Giant hogweed is native to Europe and Asia. It was first introduced into the United States in 1917 for ornamental purposes.

Identification, Biology, Control and Management Resources

Selected Images from Invasive.orgView All Images at Invasive.org


Fruit(s);
Jan Samanek, State Phytosanitary Administration, Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
Thomas B. Denholm, New Jersey Department of Agriculture, Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
Terry English, USDA APHIS PPQ, Bugwood.org
Additional Resolutions & Image Usage

Foliage;
Donna R. Ellis, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Infestation;
USDA APHIS PPQ Archive, USDA APHIS PPQ, Bugwood.org
Additional Resolutions & Image Usage

Infestation; in flower
Jan Samanek, State Phytosanitary Administration, Bugwood.org
Additional Resolutions & Image Usage

Control;
Terry English, USDA APHIS PPQ, Bugwood.org
Additional Resolutions & Image Usage

Plant(s);
Randy Westbrooks, Invasive Species Prevention Specialist, Bugwood.org
Additional Resolutions & Image Usage

Foliage;
Jan Samanek, State Phytosanitary Administration, Bugwood.org
Additional Resolutions & Image Usage

Stem(s);
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Feature(s); Stem cross-section
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Fruit(s);
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
USDA APHIS PPQ Archive, USDA APHIS PPQ, Bugwood.org
Additional Resolutions & Image Usage

Infestation; In winter
Barbara Tokarska-Guzik, University of Silesia, Bugwood.org
Additional Resolutions & Image Usage

Seed(s);
USDA APHIS PPQ Archive, USDA APHIS PPQ, Bugwood.org
Additional Resolutions & Image Usage

Seed(s);
Cesar Calderon, USDA APHIS PPQ, Bugwood.org
Additional Resolutions & Image Usage

Plant(s);
Randy Westbrooks, Invasive Species Prevention Specialist, Bugwood.org
Additional Resolutions & Image Usage

Plant(s);
Thomas B. Denholm, New Jersey Department of Agriculture, Bugwood.org
Additional Resolutions & Image Usage

Control;
Thomas B. Denholm, New Jersey Department of Agriculture, Bugwood.org
Additional Resolutions & Image Usage

Damage; Burn caused by plant (left leg, person lying down)
USDA APHIS PPQ Archive, USDA APHIS PPQ, Bugwood.org
Additional Resolutions & Image Usage

EDDMapS Distribution:
This map is incomplete and is based only on current site and county level reports made by experts and records obtained from USDA Plants Database. For more information, visit www.eddmaps.org
 


State(s) Where Reported invasive.
Based on state level agency and organization lists of invasive plants from WeedUS database.


Invasive Listing Sources:
Commonwealth of Pennsylvania, Department of Conservation and Natural Resources, 1994.
Faith Campbell, 1998
Invasive Plant Council of New York State
Mid-Atlantic Exotic Pest Plant Council, 2005
Native Plant Society of Oregon, 2008
Pacific Northwest Exotic Pest Plant Council, 1998