Alberta Invasive Plant Identification Guide
Alberta Invasive Plant Identification Guide
Alberta Invasive Plant Identification Guide
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Donna R. Ellis, University of Connecticut, Bugwood.org<br />
Hogweed, Giant<br />
Heracleum mantegazzianum, Apiaceae (Carrot Family)<br />
Category: Prohibited Noxious<br />
Information: Very tall, grows in moist areas.<br />
Life Cycle: Herbaceous biennial.<br />
Root: Large deep taproot.<br />
Leaves: Compound leaves 10-15cm wide, palmate, underside is covered in<br />
coarse white hairs.<br />
Stems: 2-6m tall, hollow stem, 5-10cm wide, covered in bristles and purple<br />
mottles.<br />
Flower: Umbel, up to 75cm wide, white, 5 petaled.<br />
Seed/Fruits: 2 wings, flat, each contains 1 seed, up to 20,000 seeds per<br />
plan.<br />
Toxicity: Sap on skin can cause rash and blisters, cover skin when dealing<br />
with this weed.<br />
Control: Manual, mechanical, stump treatment.<br />
Donna R. Ellis, University of Connecticut, Bugwood.org<br />
Terry English, USDA APHIS PPQ, Bugwood.org<br />
27<br />
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org<br />
USDA APHIS PPQ Archive, USDA APHIS PPQ, Bugwood.org
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