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WARNING:
GIANT HOGWEED
(Heracleum mantegazzianum)
Photo by Donna R. Ellis, Univ. of ConnecticutImpacts:
- Leaves and stems contain a clear, watery, highly toxic sap that can cause hypersensitivity to sunlight
- Usually results in burns, blisters, and scarring when coming in contact with skin within 48 hrs of exposure
Description:
- Perennial with a large taproot
- Can grow up to 6 m (20 ft) tall when in flower
- Large umbrella-shaped head up to 60 cm (2 ft) in diameter consisting of numerous small white flowers
- Stem hollow, ridged and green, may have dark reddish/purple tinge or spots
- Dark green, coarsely toothed, deeply incised leaves
How to get rid of it:
- Wear heavy, water-proof gloves, and water-proof coveralls or clothing that leaves no skin exposed when handling the plant. Eye protection is also recommended. (see http://www.worksafebc.com
 for further safety precautions)
- Dispose of gloves after use (heavy rubber gloves can be reused if carefully washed with soap and water). Do not get any sap on your exposed skin.
- Before starting get a few garbage bags and double them up. Put all plant material directly into these bags
- Remove lower branches to clear a safe path to the main stem
- Remove flower heads when main stem is clear to prevent seed growth and dispersal
- Using a sharp shovel sever the plant taproot 8 to 12 cm below the surface of the soil
NOTE:
- Put your double bagged plant waste into the trash, DO NOT PUT THEM INTO YOUR YARD WASTE BIN OR COMPOST
First Aid:
- If you accidentally come in contact with the sap, wash the exposed area carefully with soap and water and keep the area away from sunlight for at least 48 hours.
- If a rash or blisters develop, consult a physician. WorkSafe BC recommends that an application of an anti-inflammatory cream such as 0.5% hydrocortisone cream may reduce skin irritation.
If you have seen this plant in your neighbourhood, down your back lane or on public property, please notify 3-1-1
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© Vancouver Board of Parks and Recreation 2003-