(size, shape, color, (This form is for Massachusetts hogweed sightings only. Giant hogweed can cause ocular (eye) burns which can lead to blindness. Giant hogweed is a Federally listed noxious weed and NYS law prohibits its possession with the intent to sell, import, purchase, transport, introduce or propagate. Identify: Use the key on our giant hogweed identification page to try and make a positive identification. Giant hogweed is considered invasive and spreads rapidly. It was introduced to Britain as an ornamental plant in the 19th century, and has also spread to other areas in Western Europe, the United States, and Canada. Giant hogweed (Heracleum mantegazzianum) is an umbellifer (member of the cow-parsley family), and its flowering stems are typically 2-3 m in height bearing flower heads up to 80cm across. Giant hogweed is an invasive species. Its sap can cause a severe skin reaction known as photo-dermatitis or photo-sensitivity and damage to the eyes. These plants were brought from Caucasus Mountain region in the early 1900s to be used as a garden plant in New York. It may not necessarily express APHIS' views. Observer Name * Email * Phone (required if no email address is provided) Date Observed. WARNING: The sap of this plant causes chemical burns when activated by the sun. This species is also on the Washington quarantine list (known as the prohibited plants list) and it is prohibited to transport, buy, sell, offer for sale, or to distribute plants or plant parts, s… Giant hogweed is found in moist, sunny areas such as streams, rivers, fields, forests, yards and roadsides. texture), IF THE STEM HAS HAIRS, ARE THEY FINE OR COARSE? Giant hogweed is a very impressive plant reaching heights of over 6 feet with leaves over 3 feet long and a huge flower head — up to 20 inches in diameter. Giant hogweed is an invasive perennial herb from the carrot family (Apiaceae). If you have giant hogweed on your property, it is recommended that you hire a professional exterminator to remove it. From late April through August, DEC field crews visit each confirmed giant hogweed site, and use the appropriate control method. The Massachusetts Introduced Pests Outreach Project is a collaboration between the Massachusetts Dept. This includes Japanese knotweed, giant hogweed and Himalayan balsam. Distribute giant hogweed brochures and hang the giant hogweed poster where people will see it (e.g. Giant hogweed is a Class A Noxious Weed in Washington State due to its limited distribution in the state and the potential for significant impact to state resources. edges, texture), PLEASE DESCRIBE THE FLOWERS OR SEED HEAD, IF ANY. Photo: Leslie J. Mehrhoff, University of Connecticut, Bugwood.org. In 2020, it has been reported in 16 states: Alaska, Connecticut, Illinois, Indiana, Maine, Massachusetts, Michigan, New Jersey, New Mexico, New York, North Carolina, Oregon, Pennsylvania, Vermont, Washington, and Wisconsin.Most of these states only have a handful of counties that have reported giant hogweed sightings, but each … of Agricultural Resources and the UMass Extension Agriculture and Landscape Program. Photograph: Photos are needed to confirm identification. Its large compound leaves can grow up to 5 feet wide. Giant hogweed is often confused for cow parsnip, and other similar looking plants - compare some common lookalikes that get mistaken for giant hogweed below. Although this striking plant can be attractive in certain situations, most gardeners will want to eradicate it, as it is potentially invasive and the sap can cause severe skin burns. If you think you have giant hogweed on your property, do NOT touch it. 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