June 2009 Invasive Species of the Month Giant Hogweed (Heracleum mantegazzianum)
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What is Giant Hogweed?
Native to Asia, Giant hogweed is a member of the carrot or parsley family, and its most impressive characteristic is its massive size. It grows 10 to 15 feet tall. Because of its invasive nature, it soon becomes a pest within the garden and readily escapes. It has naturalized in many of the places where it was introduced. This plant is a public health hazard. Do not expose bare human skin to the plant or breathe the smoke from fires if it is being burned. The plant exudes a clear watery sap that sensitizes the skin to ultraviolet radiation. Humans often develop severe burns to the affected areas resulting in blistering and painful dermatitis. Blisters can later develop into purplish or blackened scars.
June 2009 calendar events
June 2009 Oregon Invasive Species Council calendar events
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Where?
Currently, giant hogweed is foundin the northwestern part of Oregon (west of the Cascades). There are isolated populations of Giant hogweed in many states, but most are being eradicated. In Oregon, about 100 Giant hogweed sited have been identified, and they are being treated.
Lookalike?
Yes, cow parsnip is a close cousin. Giant hogweed is larger, and the base of the stems are purple and bumpy. Cow parsnip stems are green and don't have bumps.
What can you do?
If you suspect you have been attacked by an Africianized honeybee, report it immediately at 1-866-INVADER or www.oregoninvasiveshotline.org
