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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.

WARNING: Do not touch! 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.

Your Name


Phone Number

Street Address



Zip Code

Latitude: Longitude: in decimal degrees

Did You Collect a Specimen?
Yes or No.

Host Plant
If applicable, what is the host plant?

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

Please upload a photo of the specimen or the site where the specimen was seen. NOTE: The photo file must be no larger than 2 MB in size.

NOTE: We are expriencing an issue in which after you click on the "Submit Report Now" button below, you will be directed to a blank page. HOWEVER, don't worry, your report will be submitted! (You may simply close the blank page.)