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Photographer: Terry English
Cover photo:

Giant Hogweed

Heracleum mantegazzianum

Origin: Euarasia

Impact: Giant Hogweed is an aggressive competitor. Because of its size and rapid growth, it out-competes native plant species, reducing the amount of suitable habitat available for wildlife. Giant Hogweed dies back during the winter months, leaving bare ground that can lead to an increase in soil erosion on riverbanks and steep slopes. Giant Hogweed contains a substance within its sap that makes the skin sensitive to ultra violet light. This can result in severe burns to the affected areas, producing swelling and severe, painful blistering.

Learn More: Species Profile.

Report Form

If you have spotted Heracleum mantegazzianum (Giant Hogweed), use this report form to send an email to the appropriate authorities. All fields marked with an asterisk (*) are required.

Your Name*


Phone Number*

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Zip Code*

Location of Observation*
Enter Latitude and Longitude in decimal degrees or Click the Choose Location button and navigate to the point where the specimen was observed on the Google Map to automatically enter Latitutde and Longitude.

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Did You Collect a Specimen?*
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Host Plant
If applicable, what is the host plant?

Comments: Describe the species, impact, infestation or generally what you are seeing.

Image Upload*
Please upload a photo of the specimen or the site where the specimen was seen. Image file must be a .jpg, .gif or .png format.