Giant hogweed now grows in some regions of Britain, other parts of Western Europe, and Canada.
According to the U.S. Department of Agriculture (USDA), giant hogweed is an invasive, noxious weed.
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What Does Giant Hogweed Look Like?
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Giant hogweed was initially grown as an ornamental plant for gardeners due to its attractive, lacelike appearance.
Giant hogweed usually flowers in mid-June.
Its white flowers grow at the top of each stem in large, flat clusters known as umbels.
If someone comes into direct contact with these compounds through the plants sap, they may experience phototoxicity.
Phototoxicity is a condition that causes the skin and/or eyes to become highly photosensitive, meaning sensitive to light.
This can lead to phytophotodermatitis, a skin reaction that mimics extreme sunburn.
Symptoms may be severe, including inflammation, redness, blisters, peeling, and permanent scarring.
In rare cases,skin graftsmay be necessary.
If giant hogweed sap gets into your eyes, you may experience vision problems and even blindness.
Some people may have permanent scars or dark spots on their skin after experiencingphytophotodermatitis.
If you touch giant hogweed sap, wash it off with soap and water right away.
check that not to touch your eyes until after youve cleaned your hands thoroughly.
Seek help from a healthcare provider if you have symptoms of giant hogweed burns, such as a rash.
However, experts recommend that you avoid trying to remove giant hogweed yourself.
Direct contact with the plants sap may result in burns.
Symptoms include skin irritation and inflammation, as well as redness and blisters.
If you see giant hogweed, its best to avoid it and tell others to avoid it as well.
Let your local Department of Conservation know if you believe you see giant hogweed in your area.
King County.Giant hogweed identification and control.
U.S. Centers for Disease Control and Prevention.Outdoor workers and poisonous plant exposures.
U.S. Department of Agriculture.
National Invasive Species Information Center.Giant hogweed.
Royal Horticultural Society.Giant hogweed.
NIH National Cancer Institute.Phototoxicity.
Kim K, Park H, Lim KM.Phototoxicity: Its mechanism and animal alternative test methods.Toxicol Res.
2015;31(2):97-104. doi:10.5487/TR.2015.31.2.097
New York State Department of Health.Giant hogweed - health advice.
2014;31(6):e156-9.
doi:10.1111/pde.12396
Jermendy G, Visolyi G.Phytophotodermatitis bullosa in an elderly patient.Postepy Dermatol Alergol.
2022;39(3):611-612. doi:10.5114/ada.2022.117538
Invasive Species Centre.Giant hogweed.
Government of Nova Scotia.Plants that may be mistaken for giant hogweed.
Poison Control.Can poison hemlock be deadly?
U.S. Department of Agriculture.
Agricultural Research Service.Poison hemlock.
