Giant Hogweed
Giant hogweed (*Heracleum mantegazzianum*) is a large herbaceous plant in the carrot family Apiaceae.
Giant hogweed (*Heracleum mantegazzianum*) is a large herbaceous plant in the carrot family Apiaceae. Native to the Caucasus region of Eurasia, it has become an invasive species in parts of Europe and North America, including Canada. The plant is known for its height and for sap that can cause severe skin reactions when exposed to sunlight.
Description
Giant hogweed is a very tall herbaceous plant with large compound leaves, a stout stem with dark blotches, and a broad umbrella-like white flower cluster. It is one of the largest species in the Apiaceae family.
Distribution and habitat
The species is native to the Caucasus region of Eurasia but has naturalized in parts of Europe and North America. It commonly grows in moist, sunny disturbed habitats such as riverbanks, roadsides, vacant land, and field edges.
Ecological and health impact
Giant hogweed is considered invasive because it can crowd out other vegetation and spread aggressively. Its sap contains chemicals that can cause painful burns, blistering, and scarring after skin exposure to sunlight.
Management
Because of its public-health risk and invasive behaviour, giant hogweed is regulated or controlled in many jurisdictions. Management generally focuses on preventing seed spread and removing established plants carefully.
Key facts
- Giant hogweed is a member of the carrot family and is scientifically named *Heracleum mantegazzianum*.
- It is native to the Caucasus Mountains and surrounding region.
- It was introduced to Britain and North America as an ornamental plant in the 19th and early 20th centuries.
- The plant has escaped cultivation and spread along roadsides, riverbanks, fields, and other disturbed sites.
- Its sap can cause phytophotodermatitis, a skin reaction that becomes worse after sunlight exposure.
Giant hogweed is an invasive species in Canada and a public-health concern because contact with the plant’s sap can cause severe skin reactions. Canadian readers may encounter it in disturbed habitats such as roadsides and riverbanks, especially in parts of eastern and western Canada.
Frequently asked questions
What is giant hogweed?
Where is giant hogweed native to?
Why is giant hogweed dangerous?
Is giant hogweed found in Canada?
How tall can giant hogweed grow?
How did giant hogweed spread outside its native range?
References
- Wikipedia — https://en.wikipedia.org/wiki/Heracleum_mantegazzianumSupports: Scientific name, common names, native range, plant family, and introduction history.
- Britannica — https://www.britannica.com/plant/hogweedSupports: Invasive status, size, toxicity, and sap-related skin effects.
- Minnesota Department of Agriculture — https://www.mda.state.mn.us/plants/pestmanagement/weedcontrol/noxiouslist/hogweedSupports: Scientific name, native range, and ornamental introduction history.
- Ohio State University Extension — https://ohioline.osu.edu/factsheet/anr-35Supports: Life cycle, habitat, native range, introduction history, and spread in North America.
- New York State Department of Environmental Conservation — https://www.dec.ny.gov/nature/animals-fish-plants/plants/harmful-plants/giant-hogweedSupports: Physical description, native range, invasive status, and health hazards.
- National Invasive Species Information Center — https://www.invasivespeciesinfo.gov/terrestrial/plants/giant-hogweedSupports: Common name and scientific name.