Giant Hogweed (Heracleum mantegazzianum) is an invasive species first introduced to the Americas from Asia as an ornamental garden plant. Looking at this giant from the carrot family you can see the beauty in such a toxic plant.
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| Giant Hogweed |
Giant Hogweed grows along streams and rivers and in fields, forests, yards and roadsides, and a giant hogweed plant can reach 15-20 feet or more in height with compound leaves up to 5 feet in width. Avoid contact with the plant, take a photo and report it in any state you live in.
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| Giant Hogweed seeds. |
Giant hogweed sap contains toxins known as furanocoumarins. When the toxins come into contact with the skin and are exposed to sunlight, they cause a condition called phytophotodermatitis, a reddening of the skin often followed by severe blistering and burns. These very painful injuries can last for several months, and even after they have subsided the affected areas of skin can remain sensitive to light for years. Furanocoumarins can also cause cancer and birth defects. The sap can also cause temporary (or even permanent) blindness if introduced into the eyes.
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| Giant Hogweed Leaves |
In South Carolina you can report Giant Hogweed to the Clemson University Plant Problem Clinic at 864-656-2677. You can send your photos to Botanist John Nelson at USC for verification, plantman@herbarium.org
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